Saturday, December 25, 2010

Meniere's disease Second edition

History:


In late 19th century Prosper Meniere described a condition characterized by ear block, tinnitus, and vertigo. He even correctly identified the site of lesion to be labyrinth. It wont be a understatement to say that precious little has been added to the knowledge and understanding of the disorder since then. Prosper Meniere infact lived far ahead of his time. He was born in 1799 in France. In 1848 he began to translate the text book on hearing loss authored by Kramer. The book was written in German. This kindled his interest in otology.
In his classical seminal reports he goes on to describe a series of patients who presented with neural deafness, with hearing loss greater for low frequencies. Deafness was commonly unilateral in these patients. These patients usually  present with tinnitus, vertigo, nausea and vomiting. He reported that these patients had a normal ear drum. He also reported that these symptoms were completely reversible.

Download the e book from here:




Thursday, December 23, 2010

Open conservative partial laryngectomy

Introduction:
Organ preservation is becoming common these days. This applies
to larynx also. Laryngeal malignancies if identified early can be
effectively managed by conservative resection procedures of
larynx.
Advantages of organ preservation:
1. The patient need not live with the stigma of permanent
tracheostomy
2. Speech is preserved to the maximum extent
3. There is effective separation of air and food channels
4. Post operative recovery is very fast
5. Option of salvage total laryngectomy is still an option if the
conservative procedure fails

Read the complete e book from here

Tuesday, December 14, 2010

Vertical partial laryngectomy

Introduction:




Vertical partial Laryngectomy is a conservative laryngeal surgical procedure which involves removal of one half of the larynx while the other half is preserved. The dead space created after removal of one half of the larynx is closed using various flaps. This surgery was first proposed by Solis – Colen in 1869 to manage early malignant lesions involving vocal folds.


Indications:


1. Malignant tumors involving a single vocal cord early T1, T2 and select T3 lesions


2. Anterior commissure of the vocal cord should be free of the lesion






This surgery is not suitable for patients with growth vocal cord involving the anterior commissure and the opposite cord.


Advantages:


1. This is a conservative procedure where in patient is able to speak without the aid of prosthesis


2. Patient need not have a permanent tracheostome


3. Patient does not have any swallowing problems


You can view the video clipping of the surgery below:
 

Monday, December 06, 2010

Tumor Biology pertaining to laryngeal malignancy

Introduction:




Recent advances in tumor biology and genetics have increased our understanding of the basic mechanisms involved in the development of laryngeal malignancy and in predicting its clinical course. The following genes / enzymes may be of use in diagnosis & in predicting the prognosis of various malignant lesions involving the larynx.






Telomerase:


A brief introduction to this enzyme is a must. A telomere is a repeating DNA sequence at the end of the chromosome. They can reach a length of 15,000 base pairs. These telomeres function by preventing the chromosome from losing base pair sequence at their ends. They also prevent chromosomes from fusing with each other. Each time a cell undergoes division some amount of telomere is lost. When the telomere becomes too short the chromosome reaches a critical length and can no longer multiply. The cell which contains this critical length chromosome is considered to be too old and undergoes cell death (apoptosis). The length of the telomere is controlled by two mechanisms:


Erosion – Occurs each time a cell divides


Addition – This is determined by the activity of telomerase


Telomerase is an enzyme made of protein and RNA subunits. It elongates the chromosomes by adding TTAGGG sequences to the end of the existing chromosomes. This enzyme is found in abundance in fetal cells, germ cells and tumor cells. If this enzyme telomerase is activated in a cell it continues to grow and divide and is known as the “Immortal cell”.






This enzyme has been linked to carcinogenesis of larynx. The presence of this enzyme in the laryngeal cancer specimen serves as a marker in diagnosing persistent malignancy after irradiation. It is very helpful in picking up radio resistant cases / recurrent cases following irradiation.


PH-20:


This is a hyaluronidase usually expressed by malignant tissues. It is usually found to be elevated in metastatic lesions and hence can be used as a valuable tumor marker in identifying early nodal metastasis.


Herpes simplex virus DNA:


Polymerase chain reaction can be used to identify Herpes simplex virus DNA. This is found to be positive in nearly 75% of patients with laryngeal malignancies. This is due to the fact that this virus protein is a proved carcinogen.


Mutations involving gene p53:


Mutations involving gene p53 correlates with the clinical outcome of patients with laryngeal cancer.


Retinoblastoma protein:


Negative expression of this protein has been associated with higher likelihood of lymph node metastasis with significantly lower 5 years survival rates.






Cyclin D1:


This has been identified by immuohistochemical staining of paraffin embedded specimen. Low levels of cyclin D1 have been associated with radio resistance.

Sunday, November 28, 2010

Haller cell

Synonyms: These are also known as Infra orbital recess cells.

Introduction:
These are pneumatized ethmoid air cells that project along the medial roof of the maxillary sinus and the most inferior portion of the lamina papyracea.
This air cell lies below the ethmoid bulla and lateral to the uncinate process.

Commonly these cells arise from anterior ethmoid air cells and are closely related to the infundibulum. Rarely these cells can arise from posterior
ethmoidal cells in which case it does not compromise the infundibulum.

Infections involving these cells can compromise and narrow the infundibulum causing obstruction to the drainage of maxillary sinus ostium.  It has been suggested that infections involving these cells could be a factor in recurrent maxillary sinusitis.




Thursday, November 25, 2010

The Tamilnadu Dr MGR Medical University MS(ENT) Basic sciences September 2009 question paper with solution

The Tamilnadu Dr MGR Medical University MS(ENT) Basic sciences September 2009 question paper with solution

Get it from here.

Monday, November 22, 2010

CSF rhinorrhoea repair using bicoronal approach

Clinical details:

30 years old male patient came with c/o watery discharge from left nasal cavity - 3 years duration
H/O Road traffic accident 3 years back following which watery discharge started.
H/O meningitis 2 years back for which he was treated.
H/O Head ache on and off ++.

On examination:

Watery discharge was seen flowing out of left nasal cavity. It was more pronounced when the patient bent down.

Imaging:

CT paranasal sinus showed fracture involving the posterior table of frontal sinus with evidence of pneumatocele in the left
frontal lobe.















Management:

Since the fracture was present laterally in the posterior table of frontal sinus external approach was preferred.
Bicoronal approach was used to expose the anterior table of frontal sinus.
The incision begins in the preauricular crease at the level of tragus and traverses the scalp 3-4 cms behind the hair line.
The incision is carried down through the galea to the loose alveolar plane above the calvarial periosteum and the deep temporal
fascia and the flap is elevated anteriorly until approximately 2cms above the supra orbital rims. At this point the periosteum is
incised and the dissection is continued in the subperiosteal plane. The supraorbital neurovascular bundles are protected.
Laterally the dissection continues in the subgaleal plane up to 1-2 cms above the zygomatic arch. The deep temporal fascia
is incised at this point and the dissection continues deep to the temporal pad of fat over the temporalis muscle and the investing
fascia. The deep temporal artery perforators should be protected if not this could lead to a hallowing in the temoporal area due
to wasting of temporalis muscle.
The anterior table of frontal sinus is exposed. A window is created over the anterior table of frontal sinus using a fissure burr.
The interior of frontal sinus was visualized and the leak was identified over the posterior table of left frontal sinus which was
sealed using tissue glue and abdominal fat.


window.JPG























Friday, November 19, 2010

Interesting case of fibroma sphenoid sinus

Clinical details:

18 years old boy came with c/o blocking sensation both nasal cavity - 1 year duration
Decreased sensation of smell - 6 months duration
He gave h/o repeated attacks of upper respiratory infection
He gave no h/o bleeding from nose
No h/o head ache

On examination:

Anterior rhinoscopy:
A pale mass could be seen occupying the posterior portion of right nasal cavity.
Post nasal examination:
The same mass could be seen occupying the nasopharynx occluding both choana.

CT scan nose and paranasal sinuses plain / contrast were taken.

It showed non enhancing mass arising from sphenoid sinus entering the post nasal space and the posterior portion of right nasal cavity.














Management:

This patient was taken up for endoscopic sinus surgery and the mass was removed completely in toto.
Histopathology report - fibroma
Fibroma involving sphenoid sinus and post nasal space are commonly vascular (angiofibroma). In this case the fibrous elements
predominated and hence the mass was not enhancing in contrast CT. There was no abnormal bleeding during surgery.



Saturday, November 06, 2010

The Tamilnadu Dr MGR Medical University MS (ENT) Basic sciences march 2009 question paper with solution

In my continuing effort to help out post graduate students of otolaryngology I have uploaded the MS (ENT) Basic sciences question paper with solutions of Tamilnadu Dr MGR Medical university.

Basic sciences post graduate question papers have always been dicey.  Unless you prepare diligently for the same you may encounter pit falls.  The whole question paper has been broken down into sub topics i.e. anatomy, physiology, pathology and biochemistry.  Since each of these sections will be evaluated by different examiners belonging to basic sciences department you need to concentrate equally on all these sections.

You can access the question paper with solutions from here.

Friday, October 29, 2010

Lingual thyroid and its management

Clinical details:

6 years old female patient came with complaints of:
1. Difficulty in swallowing - 6 months
2. Occasional episodes of bleeding from mouth - 2 months

On examination:

Oral cavity: Pinkish globular mass could be seen in the posterior 1/3 of tongue. The mass was firm on palpation. The posterior border of the mass was not visible on oral examination.
Both tonsils were found to be enlarged grade III.



















Radiology:

X ray soft tissue neck lateral view:

















X ray soft tissue neck lateral view showing mass in the suprahyoid region occupying posterior 1/3 of tongue.
Axial CT scan of neck showing mass involving the posterior 1/3 of tongue.


Contrast CT axial view showing absent thyroid gland in the neck
Ultrasound neck: Absent thyroid gland in the neck

Thyroid profile:

Pt was euthyroid with normal serum T3 T4 and TSH levels

Management:

Patient was taken up for surgery.
supra hyoid midline approach was preferred.
Skin crease incision is made just below the hyoid bone in the neck.
Skin flap elevated in the subplatysmal plane. Hyoid bone was exposed.
Supra hyoid muscles were resected from the superior border of hyoid bone
Mylohyoid muscle fibers are resected and retracted. Lingual thyroid mass removed in toto and the wound closed in layers.

Discussion:

Lingual thyroid is a rare embryonic aberration with an incidence rate of 1 in 100,000 individuals.
This condition is invariably due to failure of descent of thyroid gland. Parathyroid glands in these patients will
be found in the neck in their normal positions because of their separate origin embryologically.
Symptoms are invariably caused due to the mass effect of the lesion. It has also been pointed out that these
ectopic thyroid gland may not be in a position to cater to the increasing demands of thyroxine during menarche / pregnancy and
may undergo enlargement causing increasing symptoms. Incidence of malignancy is also more in ectopic thyroid glands hence
it is always better to resect the gland and place the patient under supplemental thyroid hormones.
Surgical approaches:
1. Removal via the oral cavity: This is the commonly practiced approach. This approach has the advantage of avoiding neck incisions.
The mouth of the patient is kept open by using Boyle's Davis mouth gag. Using either diathermy / laser / cobalator the dissection is
started from the anterior border of the mass and it is removed totally by encircling incision. Bleeders if any can be cauterized using
a bipolar cautery. This approach is advisable if the posterior border of the lesion is visible on opening the mouth.
2. Suprahyoid midline approach: This is another commonly used approach which has been described already. This lesion is useful
in patients with large lingual thyroid mass.
3. Lateral pharyngotomy approach: This approach is useful in removing big mass with a predominant vascular supply from the lingual
artery. This approach will also facilitate repositioning of ectopic thyroid mass in the neck.
4. Midline mandible and tongue splitting approach: Useful in adults with a huge lingual thyroid mass. The mandible is slit in the midline
by performing a midline osteotomy. The tongue is slit right in the middle till the foramen cecum portion is reached. The lingual
thyroid mass is removed in an encircling manner.




Saturday, October 23, 2010

Fibrous dysplasia posterior ethmoid with blindness

Complaints:

48 years old male patient came with complaints of loss of vision left eye - 6 months duration.
Persistent left nasal block - 4 years
Discharge from left nose - 4 years
Head ache more on the left side - 5 years (Deep boring in nature)

Past history:

No history of epistaxis
No history of loss of smell

On examination:

Anterior rhinoscopy was unremarkable.
Post nasal examination normal.
Vision was absent in the left eye.

Imaging:

 

 

 

 

 

  

 

CT scan plain axial cut paranasal sinuses show heterodense mass arising from left posterior ethmoid air cells extending up to the anterior face of sphenoid. The mass could be seen compressing the left optic nerve. Diagnosis (Fibrous dysplasia)






 

MRI showing mass arising from posterior ethmoidal air cells on the left side compressing the left optic nerve.

 

Management:
This patient was taken up for endoscopic surgery. The mass from the left side of the nasal cavity was progressively drilled out under endoscopic vision.



Discussion:

The term fibrous dysplasia was first introduced by Litchtenstein in 1938. Usually fibrous dysplasias affect children commonly
in their teens (during the growth phase).
In any fibrous dysplasia involving the nasal cavity and paranasal sinuses the clinical presentation
is initially related to sinus obstruction, visual disturbance, facial asymmetry and nasal blockage.
In fibrous dysplasia the normal woven bone is replaced by isomorphous fibrous tissue and poorly
formed woven bone.

Classification:

Fibrous dysplasias have been classified into:
Monostotic - Involves single bone
Polyostotic - Involves multiple bones
Albright's syndrome - Endocrine hyperfunction, Unilateral Café-au-lait spots, and polyostotic fibrous dysplasia
Among these types the monostotic fibrous dysplasia is more common accounting for 70% of all fibrous dysplasias.
Rarely fibrous dysplasia may become more aggressive and dedifferentiate causing (desmoplastic fibroma). Sometimes the tissue may undergo sarcomatous transformation.
Excision of these mases makes sense because of their propensity to undergo malignant transformation.
Risk factors for malignant transformation include:
1. Polyostotic form
2. Post radiation sequelae
3. Facial bone involvement
4. Albright's syndrome




 

 

Fibrous dysplasia posterior ethmoid with blindness

This is an interesting case report of a patient with fibrous dysplasia of posterior ethmoid with blindness.

Complaints:

48 years old male patient came with complaints of loss of vision left eye - 6 months duration.
Persistent left nasal block - 4 years
Discharge from left nose - 4 years
Head ache more on the left side - 5 years (Deep boring in nature)

Past history:

No history of epistaxis
No history of loss of smell

On examination:

Anterior rhinoscopy was unremarkable.
Post nasal examination normal.
Vision was absent in the left eye.

Imaging:

 

 


<>












CT scan plain axial cut paranasal sinuses show heterodense mass arising from left posterior ethmoid air cells extending up to the anterior face of sphenoid. The mass could be seen compressing the left optic nerve. Diagnosis (Fibrous dysplasia).
















MRI showing mass arising from posterior ethmoidal air cells on the left side compressing the left optic nerve.

Management:
This patient was taken up for endoscopic surgery. The mass from the left side of the nasal cavitywas progressively drilled out under endoscopic vision.



Discussion:

The term fibrous dysplasia was first introduced by Litchtenstein in 1938. Usually fibrous dysplasias affect children commonly
in their teens (during the growth phase).
In any fibrous dysplasia involving the nasal cavity and paranasal sinuses the clinical presentation
is initially related to sinus obstruction, visual disturbance, facial asymmetry and nasal blockage.
In fibrous dysplasia the normal woven bone is replaced by isomorphous fibrous tissue and poorly
formed woven bone.

Classification:

Fibrous dysplasias have been classified into:
Monostotic - Involves single bone
Polyostotic - Involves multiple bones
Albright's syndrome - Endocrine hyperfunction, Unilateral Café-au-lait spots, and polyostotic fibrous dysplasia
Among these types the monostotic fibrous dysplasia is more common accounting for 70% of all fibrous dysplasias.
Rarely fibrous dysplasia may become more aggressive and dedifferentiate causing (desmoplastic fibroma). Sometimes the tissue may undergo sarcomatous transformation.
Excision of these mases makes sense because of their propensity to undergo malignant transformation.
Risk factors for malignant transformation include:
1. Polyostotic form
2. Post radiation sequelae
3. Facial bone involvement
4. Albright's syndrome

Friday, October 22, 2010

The Tamilnadu Dr MGR Medical University MBBS Prefinal Otolaryngology March 2010 question paper with solution

The Tamilnadu Dr MGR Medical University MBBS Prefinal Otolaryngology March 2010 question paper with solution has been uploaded.

Get it from here.

Thursday, October 14, 2010

Interesting case report of invasive mucor mycosis causing palatal destruction

Clinical details:
38 years old female
Diabetic on poor glycemic control
Complaints:

Ulcerative lesion of right side of hard palate - 2 years
Devitalization of upper premolars - 6 months
On examination:

Nasal cavity - Whitish mass seen inside the right nasal cavity. The mass was insensitive to touch and cheesy.
Floor of right nasal cavity found to be eroded.

Oral cavity - Slough covered lesion seen in the right side of hard palate. On probing there was no bone palpable
through the slough.















Investigations:
Biopsy from the lesion was reported as mucormycosis.
These fungi can be seen as large number of aseptate ribbon like hyphae with right / obtuse angle branching in necrotic tissue.

Imaging:




















Ct scan showing heterodense mass occupying the right maxillary sinus with destruction of its medial wall.
The mass could be seen extending to the right nasal cavity with destruction of the floor of right nasal cavity.

Discussion:

Synonyms include - zygomycosis / phycomycosis
Two main types of mucor mycosis infections occur in humans. They are superficial and visceral.
Superficial mucormycosis involves external ear, fingers and skin commonly.
The visceral form could be Gastrointestinal, rhinocerebral, pulmonary or disseminated.
Visceral forms of mucor infections are common in diabetics and immune compromised individuals.
Among these visceral types the rhinocerebral type is the most common. This is due to the fact that the
nasal mucosa is normally colonized by mucor. Rhinocerebral mucor mycosis can be subclassified into two types.
They include:
Type I - Rhino orbito cerebral. This form is highly fatal
Type II - Rhinomaxillary form. This form is not fatal. This case belongs to type II category.
Mucor infections has a strong prediliction to involve blood vessels, nerves and lymphatics. Invasion of arteries causes
avascular necrosis of the infected area.
Mucor is known to thrive in acidic and glucose rich medium, which is common in a diabetic. Hyperglycemia also impairs
neutrophil chemotaxis thereby reducing immunity.
In addition increased availability of micronutrients like iron in diabetics increase the pathogenecity of the organism.

Management:

Is by wound debridment.
Control of diabetes.
Administration of amphoteracin B.




Tuesday, October 05, 2010

Tamilnadu Dr MGR Medical Univeristy MBBS Prefinal otolaryngology september 2010 question paper with solution has been upped

The Tamilnadu Dr MGR Medical University Prefinal MBBS otolaryngology September 2010 question paper with solution has been released. Access it from here.

Monday, October 04, 2010

drtbalu's otolaryngology resources: Laryngomalacia

drtbalu's otolaryngology resources: Laryngomalacia: "Introduction: The term Malakia in Greek means softening. The term indicates softening of larynx. This is a disease of infants and children..."

Laryngomalacia

Introduction:

The term Malakia in Greek means softening. The term indicates softening of larynx.
This is a disease of infants and children. This disease is characterised by the presence of stridor which is caused due to excessive redundancy of supraglottic tissues which gets sucked into the glottis due to the negative pressure caused during inspiration. The stridor in these patients are inspiratory in nature.

Age of onset:
This condition gets manifested within first two weeks after birth and usually resolves when the child reaches the age of 2.

Pathophysiology:

1.Excessive redundancy of supraglottic soft tissues
2.Immaturity of neuromuscular system
3.Immaturity of cartilages of larynx
4.GERD
5.Submucosal gland hyperplasia

Possible mechanisms causing stridor in these patients include:

1.Indrawing of cuneiform cartilages on inspiration
2.Omega shaped epiglottis of infants curls upon itself
3.The arytenoids collapse inwards
4.The epiglottis gets displaced against the posterior pharyngeal wall
5.Short aryepiglottic folds
6.Overtly acute angle of epiglottis at the laryngeal inlet

Get the full article from here.

Monday, September 27, 2010

Sialendoscopy

Introduction:

Common disorders of salivary glands involve obstruction involving their ductal system. Salivary gland calculi comprises the most common cause of enlargement of salivary glands. Obstructions could be caused by the presence of calculi, strictures of the duct etc. Sialoendoscopy is the most preferred mode of treating obstructions involving major salivary glands. Major advantage of this procedure is that it can be performed under local anesthesia as an office procedure.

History:

It was Konigsberger and his colleagues first used sialoendoscopy and lithotripsy to treat salivary gland calculi in 1990. During the year 1991 Gundlach and colleagues published their experience of doing sialoendoscopic procedures. Katz in 1991 used a 0.8 mm flexible endoscope to diagnose sialolithiasis and to remove them from major salivary glands. It was Kongisberger and colleagues who successfully used a flexible mini endoscope and intracorporeal lithotriptor to fragment major salivary gland calculi, thus opening up new vistas.
In 1994 Arzoz and his colleagues first introduced a 2.1 mm rigid endoscope which had a 1mm working channel as sialendoscope. This was indeed a mini urethroscope. They also used a Pneumoballistic lithotriptor along with this endoscope to hit the calculus and break it. This work was followed by Nahlieli who published his three years experience with rigid sialendoscope in the year 2000.


Read the full e book from here

Tuesday, September 14, 2010

Pseudocyst of Pinna

This condition involves the Pinna and can frequently recur even after successful treatment. It goes by various names i.e. intercartilagenous cyst, endochondral Pseudocyst and idiopathic cystic chondromalacia. This condition was first described by Engel in 1966.

Clinical features:

1.Presents as painless, spontaneous dome shaped cystic swelling on the anterior surface of auricle.
2.This condition is predominantly seen in adult males
3.It is uncommon before 20 and after 60 years of age.
4.Majority of these cysts are found in the scaphoid and triangular fossae of the pinna
5.Majority of these cysts have been reported in Chinese. Chinese have attributed this problem due to the firm pillow they use to sleep. Studies have not demonstrated any racial differences.
6.Right ear is more commonly affected than the left. This has been attributed to the habit of majority of individuals to sleep on their right side.

Read the full article from here

Monday, September 13, 2010

Congenital Epulis

Introduction:
“Epulis” is a Greek term meaning Gums. This term is used to denote a wide variety of lesions involving the gums regardless of their pathology.
This is a rare congenital growth affecting the gingival mucosa of neonates. It is also known as Neumann’s tumor. It is truly a benign condition affecting predominantly female infants. It may even be multiple. This tumor was first described in 1871 by Neumann and hence the name.

These tumors are commonly present at birth arising from the gingival mucosa of maxilla / mandible. These infants may have feeding and breathing difficulties because of the mass effect. Ultrasound studies have shown that this tumor can arise as early as 26th week of gestation.

Get the whole article from here.

Wednesday, September 08, 2010

Rhinitis medicamentosa


Introduction:

Rhinitis medicamentosa is a condition characterised by nasal congestion without rhinorrohea or sneezing. This condition is caused by the use of topical nasal decongestants for a prolonged period of time. Use of these topical decongestants for more than a week is sufficient to cause this problem. This condition should be differentiated from rhinitis caused by use of drugs like oral contraceptives, antihypertensives and psychotrophic drugs.

History:

The term rhinitis medicamentosa was coined by Lake in 1946.

Synonyms:

Rebound rhinitis / chemical rhinitis

Pathophysiology:

The nasal mucous membrane is rich in resistance blood vessels draining into capacitance venous sinusoids. These resistance blood vessels include small arteries, arterioles and arteriovenous anastomosis. The capacitance vessels (venous sinusoids) are innervated by sympathetic fibers. Sympathetic stimulation causes activation of alpha 1 and alpha 2 receptors present in the walls of the capacitance vessels which leads to decreased blood flow and constriction of venous sinusoids causing nasal decongestion. Parasympathetic stimulation causes release of acetyl choline which increases nasal secretions. Parasympathetic stimulation also causes release of VIP (vasoactive intestinal polypeptides) causing vasodilatation of the resistance blood vessels leading on to dilatation of sinusoids there by causing nasal congestion. In addition to sympathetic and parasympathetic innervation the nasal mucosa is richly endowed with sencory type c fibers. These sensory fibers on stimulation releases neurokinin A, calcitonin gene related peptide and substance P. These substances cause down regulation of sympathetic vasoconstriction causing nasal congestion. The exact pathophysiology of rhinitis medicamentosa is still not clear. Various hypothesis exist. Almost all of them focus on dysregulation of sympathetic / parasympathetic tone by exogenous vasoconstriction molecules.


Possible mechanisms of rhinitis medicamentosa include:

  1. Secondary decrease in the production of endogenous norepinephrine through a negative feed back mechanism
  2. Sympathomimetic amines used as topical decongestants have effects on both alpha and beta receptors. Their alpha effects predominate over beta effects causing nasal decongestion. This beneficial alpha effect is short lived while beta effect is more prolonged. After cessation of alpha stimulation the sympathomimetic amines still keep stimulating beta receptors causing rebound nasal congestion.
  3. Rebound increase in parasympathetic activity causing increased nasal secretion and nasal mucosal congestion



    Get the whole article from here

Saturday, September 04, 2010

Primary itching of external auditory canal and its management

Introduction:

Patients with itchy ear are said to be suffering from “itchy ear syndrome”. Sometimes the itching in the external auditory canal may be so severe that it may even disrupt sleep.

Classification of itchy ear:

Itchy ears has been classified into primary and secondary types.

Secondary itching: of the external auditory canal may be caused by:

1.Dermatitis – contact / seborrhoeic
/ dermatomycosis
2.Systemic disorders causing itching include – jaundice, diabetes, and renal pathology


Primary itching:

In patients with primary itching there is no evidence of dermatitis or systemic disorders which have been attributed to be the causative factors of secondary itching. These patients may at the most have pathogenic colonization of the external auditory canal.
These patients are commonly middle aged or elderly women.

Predisposing features of primary itching include:

1.Excess moisture in the external auditory canal
2.Changes in pH of cerumen
3.Obstruction to external auditory canal due to presence of wax


Management:

These patients can be managed by

1.Topical application of 2% acetic acid
2.Appication of soothing agents like coconut oil
3.Application of topical steroids like triamcinalone
4.Application of silver nitrate gel
5.Oral antihistamines

Long term application of topical steroids is frought with a lot of complications. This includes thinning of epidermis, decreased microvasculature and a reduction in the number of keratinocytes.

Current therapy:

Pimecrolimus
a new topical immunosuppressive agent has shown immense promise in the management of this disorder. This is an immunomodulating agent which has been successfully used in the management of atopic dermatitis. This drug is a macrolactum derivative and is known to inhibit calcineurin which is known to cause itching in these patients.

Wednesday, September 01, 2010

Role of sphenoplatine ganglion block in managing cluster headaches

Introduction:
Cluster head ache (suicide headache) is one of the most painful of all headache syndromes. It is characterized by very severe orbital / temporal pain occuring usually on the same side lasting between 15-150 minutes if not treated. Cluster headache attacks are usually associated with rhinorrohea, lacrimation, conjunctival injection, perspiration and psychomotor agitation. These clusters usually occurs during “cluster periods” which range between 6-12 weeks with painless intervel inbetween.

Pathophysiology:

Current views suggest that cluster headaches are caused by central mechanisms which are triggered by reflex arc involving the sphenopalatine ganglion. Hypothalamus has been suspected to play an important role in the pathophysiology of cluster headaches. That is the reason for using deep brain stimulation of the posterior nucleus of hypothalamus in managing drug resistant cases of cluster headaches.

Role of sphenopalatine ganglion block:

Recent studies have shown promising results when sphenopalatine ganglion is blocked. This can be carried out transnasally with minimal intervention under endoscopic vision. This can easily be achieved by a mixture of local anesthetics and steroids. These drugs should be delivered as close to sphenopalatine ganglion as possible. After decongesting and anesthetizing the nasal cavity a solution of triamcinolone acetonide (40 mg), 1% bupivacaine (4 mL), and 2% mepivacaine with 1/100,000 adrenaline (2 mL) in an average of three (range 2– 4) weekly sessions Injection is usually administered with a 20 gauge needle close to the tail of the middle turbinate (this is the approximate location of sphenopalatine ganglion). Care is taken not to damage the sphenopalatine artery. Two to three injections may be adminstered in a space of 4 – 6 weeks.

Sunday, August 29, 2010

Carotid blow out syndrome

This is an extremely high risk condition associated with significant degrees of morbidity and mortality. This condition commonly results from invasion and destruction of cervical carotid vasculature from head and neck squamous cell carcinomas. Prompt diagnosis of this condition and active intervention will help in saving lives of these patients.


Causes of carotid blow out syndrome:


1.Aneurysms
2.Infections – cause vasovasorum thrombosis leading on to necrosis of carotid walls.
3.Secondary carcinomatous deposits in cervical lymph nodes
4 Following irradiation for secondary carcinomatous deposits in the neck – Free radicals caused during irradiation causes thrombosis of vasovasorum leading on to breakdown of carotid artery wall. Patients develop fibrosis and thinning of the cartotid arterial wall leading on to blow out.


Read the full article from here.

Wednesday, August 25, 2010

Avoiding pitfalls in endoscopic skull base surgery


Introduction:

The advantages of endoscopic approach to skull base are many. They include:

  1. It is the most direct route to anterior skull base. This approach provides access to the following areas Sella, Cribriform plate, Planum sphenoidale, suprasellar cistern, Clivus, Pterygopalatine fossa and adjacent parasellar areas.
  2. In this approach there is decreased retraction of brain and cranial nerves when compared to that of conventional neurosurgical apporaches.
  3. Endoscope offers excellent visualization of the tumor and the surrounding neurovascular structures
  4. Post operative recovery time is short when compared to that of conventional neurosurgical approaches
As with any other procedure this method also has its flip side, which includes a steep learning curve, and need to collaborate with neurosurgeon. A cohesive collaboration with neurosurgeon is a must for successful endoscopic skull base surgical procedures.The complicated anatomy of skull base has managed to bridge these two specialities. In a nut shell an otolaryngologist navigates the pathway to the intracranial lesion while the neurosurgeon removes the tumor.

Dangers of endoscopic skull base surgery:

Since the skull base has many vital structures it should be performed with the highest degree of deligence and skill. The potential complications of any endoscopic skull base surgery include:

  1. CSF rhinorrhoea
  2. Injury to great vessels (internal carotid artery and its branches inside the skull)
  3. Injury to optic nerve
  4. Injury to other cranial nerves
  5. Bleeding from cavernous sinus
  6. Meningitis

    Click on the image below to read the  e book.http://www.drtbalu.co.in/skull_base.html




Wednesday, August 18, 2010

Gradenigo's syndrome E module

In continuation with my effort in creating learning modules I have come out with a module titled "Gradenigo's syndrome".


Tuesday, August 17, 2010

Nasal topical therapeutics

Intranasal drug delivery systems for the management of local and systemic
ailments have caught up recently. Initially this route of drug administration
was attempted for the management of allergic rhinosinusitis. Now inflammatory sinusitis is also managed by intranasally administered drugs. The reasons for interest in this route of drug administration because of its high vascularity, porous endothelial basement membrane and a high total blood flow per volume of tissue. Since first pass metabolism is avoided in this drug delivery method the drug is metabolized slowly thus helping in reducing the dosage of the drug. This also goes a long way in reducing the potential toxicity of the administered drug even if it has a very low therapeutic index. The complex nasal anatomy and the varying dynamics of nasal air flow make this drug delivery modality a little bit unpredictable. This is more so especially in patients with nasal cold which is associated with congestion of nasal mucosa and turbinates.







You can read the complete e book by clicking  the link below:

http://www.drtbalu.co.in/nasal_thera.html





Monday, August 02, 2010

Unique e module on chronic tonsillitis by drtbalu

I have given a unique e learning module on chronic tonsillitis.

This will be very useful for exam going students of otolaryngology.

You can expect more such modules in future:


Friday, July 30, 2010

E book of the week : Role of Debriders in Otolaryngology

E book of the week:


"Role of Microdebriders in Otolaryngological surgery"


This freely downloadable e book discusses the current role of
Microdebriders in Otolaryngology.


 

Sunday, July 25, 2010

Friday, July 23, 2010

A rare case of tuberculosis tonsil

Introduction:

Tuberculosis involving the tonsil is very rare. These days it is still rare because of better milk processing techniques like pasteurization which eradicates the bovine strain of tuberculosis. Even though tonsils are situated in an exposed area where infected material like sputum and food stuffs come into contact this lesion is rare because of the following features:

1. Antiseptic and cleansing action of saliva (first and foremost)

2. Presence of saprophytic organisms in the oral cavity which prevents growth of tubercle bacilli

3. The stratified squamous epithelial lining of the tonsil also offers some degree of protection

Tuberculosis of tonsils may be:

Primary - Due to ingestion of infected milk (Bovine strain)

Secondary - Due to pulmonary infection. The coughed out infected sputum finds its way to the throat to involve the tonsils.

Diagnosis of tuberculosis of tonsil is not straight forward. It needs high degree of suspicion.

Pointers for the diagnosis of tuberculosis tonsil:

1. Asymmetric enlargement of tonsil

2. Tonsillar enlargement without exudate

3. Obliteration of crypts

4. Painful deglutition

5. Presence of enlarged mobile jugulodigastric nodes

















Clinical photograph of a patient with Tuberculosis tonsil


View the full case details from here.

Monday, July 19, 2010

Vocal cord paralysis

Definition: Vocal cord paralysis is caused by paralysis of intrinsic muscles of larynx. This is a symptom of an underlying disorder and not a disease by itself. The intrinsic muscles of the vocal cord are supplied by the vagus nerve. The term vagus means "wanderer" which is the apt term to describe this nerve becuase of its long anatomical course.

Unilateral vocal fold paralysis occurs due to dysfunction of recurrent laryngeal or vagus nerve causes a breathy voice. The breathiness of voice is caused by glottic chink which allows air to escape when the patient attempts to speak. Normal voice production is dependent on proper glottal closure resulting from bilateral adduction of the vocal cords. This adduction of vocal folds combined with subglottic air pressure causes the vocal folds to vibrate causing phonation.

you can read the full e book from here.

Thursday, July 08, 2010

Surgical management of puberphonia recent concepts

Introduction:


Mutational falsetto is also commonly known as Puberphonia. This condition is caused due to the failure of the voice to drop in its pitch from the higher levels after puberty. These patients hence suffer from lack of resonance in voice, breathiness of voice and lack of pitch variations. These patients have easy fatigability of voice and are unable to raise their voice in noisy environments.

This condition is caused due psychological problems in the patient which prevents lowering of the pitch of the voice of an adolesecent to that of a adult range. Puberphonia is more common in adolescent males and may also occur rarely in females.


The following are the probable psychological factors that could lead to the developement of puberphonia:


1. Over identification of the affected boy with his mother
2. Failure of the boy to accept his adult male role
3. Social immaturity
4. Anxiety to maintain a Soprano voice
5. Incordination of muscles of vocalization

Surgical management of Puberphonia:


When all the above conservative methods fail then surgery will have to be resorted to. Isshiki type III relaxation thyroplasty has shown promise in managing these patients. This surgical procedure lowered the pitch of voice in these patients by shortening the length of the vocal folds. In the classic Isshiki type III thyroplasty 2 – 3 mm of vertical strips of cartilage were excised on each side of midline of thyroid cartilage. This procedure caused retrusion of the middle portion of the thyroid cartilage causing a reduction in the length of the vocal folds.

Various modifications of Type III Ishikki thyroplasty have been proposed.


View the full article from here.

Anatomical changes that occur in ethmoid sinuses following FESS

Introduction:


The bony walls of paranasal sinuses demonstrate excellent degree of plasticity. This feature allows alterations in the size and dimensions of paranasal sinuses during growth phase. The process of pneumatization of paranasal sinuses begins in utero and continues through teenage years.

Causes of pathological expansile alterations of paranasal sinuses include:


1. Allergic fungal sinusitis
2. Extensive sinonasal polyposis
3. Mucocele formation
4 Benign tumors


While performing endoscopic sinus surgery it should be borne in mind that it is being performed in a setting of bony changes, with an intention to halt the expansile / contractile changes that are likely to take place.


View the full article from here.

Tuesday, July 06, 2010

Dysontogenic cysts of floor of mouth


Introduction:

Dysontogenic cysts are otherwise known as dermoid cysts. These cysts develop due to defective embryonic development. This cyst includes any cyst which are filled with sebum like material with evidence of presence of specialized skin derivatives.

Meyer's classification of Dysontogenic cysts of floor of mouth:

Meyer classified dysontogenic cysts of floor of mouth into 3 types, namely

Epidermoid

Dermoid

Teratoid

Epidermoid cyst: is usually lined with stratified squamous epithelium without adnexal structures.

Dermoid cyst: is lined with stratified squamous epithelium with the presence of adnexal structures. These adnexal structures include sebaceous cysts, hair follicles and sweat glands.

Teratoid cyst: Features of teratoid cysts include the presence of lining squamous epithelium, respiratory epithelium, dermal appendages and distinct mesodermal components.

Eventhough dysontogenic cysts can occur anywhere in the body, about 10% of them occur in the floor of the oral cavity. Congenital cysts occuring in the infancy have also been reported.


Clinical features:

These include:

  1. Dysphagia
  2. Dysphonia
  3. Stridor


Pathophysiology:

These cysts can be congenital / acquired in nature.

Congenital cysts are derived from ectodermal differentiation of multipotential cells that could have been pinched off during the closure of the anterior neuropore. Commonly accepted theory explaining congenital cysts is that it is caused due to entrapment of midline ectodermal tissue during fusion of first and second branchial arches during the third week of gestation. Lateral dysontogenic cysts are said to arise from the first pharyngeal pouch or first branchial cleft.

Acquired dysontogenic cysts can be explaine by Baker's theory. According to Baker trauma is the commonest cause of acquired dysontogenic cysts. Trauma causes implantation of epithelial cells into deep tissues. These implanted tissues results in formation of cystic cavities filled with keratin.


Differential diagnosis:

These cysts should be differentiated from:

  1. Ranula
  2. Obstructed wharton's duct
  3. Thyroglossal tract cyst
  4. Branchial cleft cyst
  5. Lymphatic malformation
  6. Pleomorphic adenoma
  7. Enlarged submental glands
  8. Prominent submental fat mass

Investigations:

Ultrasound examination will help in differentiating cystic from solid lesions. It ofcourse has the advantage of being easily available, cost effective and rapidly performed investigation.

MRI: Provides excellent soft tissue detail. It helps in differentiating mass from surrounding soft tissues. T2 weighted images of dysontogenic cysts shows hyperintense areas due to high proteinaceous content.

Treatment:

Complete excision of the mass is the ideal treatment modality. Almost all dysontogenic cysts of floor of the mouth can be approached through intraoral approach. All submental cysts should be approached through the neck. A cyst that has breached the floor of mouth musculature should ideally be approached through the neck.

Wednesday, June 30, 2010

Inverted papilloma of nose and its management

Introduction: Inverted papilloma is a benign lesion occuring in the nasal cavity and paranasal sinuses. Eventhough these tumors are classified as benign they are known to cause local destruction, known to recur and also can under go malignant transformation to squamous cell carcinoma.

History: Ward in 1854 described the macroscopic features of papilloma of nose. He used the term papillomatous neoplasm to describe this lesion. Billroth in 1855 used the term villous carcinoma to describe inverted papilloma because of its propensity to destroy local tissues and recurrence after surgery. Hopmann in 1883 used the terms hard and soft papilloma to ascertain the stoma : epithelium ratio. This classification ofcourse was not useful because the number of epithelial layers varied within the various areas of the same specimen.
Ringertz in 1938 coined the term inverted papilloma after recognizing the characteristic endophytic growth pattern demonstrated by this type of papilloma. Kramer and Som in 1935 used the term genuine papilloma of the nasal cavity. Berendes in 1966 after taking congnizance of the destructive properties of this lesion used the term Malignant papilloma to indicate this mass. Hyams in 1971 classified nasal papillomas as inverted papilloma (to indicate papillomas with endophytic growth) and fungiform papilloma. He also included a third group cylinderical papilloma to accomodate the variantions seen in these papillomas. Batsakis in 1987 used the term inverted Schneiderian papilloma indicating its origin from the Schneiderian membrane (nasal mucosa). Michaels in 1996 regarded the three types of nasal papilloma as three completely distinct entities whereas Eggers in 2005 considered these three types of nasal papillomas as hybrid lesions.

Synonyms: As indicated above various synonyms have been used to indicate inverted papilloma of nose. They include:

1.Schneiderian papilloma
2.Inverted papilloma
3.Benign papilloma of nose
4.Cylindroma
5.Malignant papilloma of nose




Definition: The mucosal lining of nose and paranasal sinuses is known as Schneiderian membrane in memory of Victor conrod Schnider who described its histology. Papillomas arising from this membrane is very unique in that they are found to be growing inwards and hence the term inverted papilloma. These papillomas are unique in their history, biology and location. Papillomas involving the vestibule is not included in this group because histologically, biologically and behavior wise it is different.



You can download the e book by clicking at the image below.

 

Friday, June 25, 2010

Rhinosporidiosis still an enigma


Introduction:
Rhinosporidiosis has been defined as a chronic granulomatous disease characterized by production of polyps and other manifestations of hyperplasia of nasal mucosa. The etiological agent is Rhinosporidium seeberi.

Theories of mode of spread:
  1. Demellow's theory of direct transmission
  2. Autoinoculation theory of Karunarathnae (responsible for satellite lesions)
  3. Haematogenous spread - to distant sites
  4. Lymphatic spread - causing lymphadenitis (rarity)





    Reasons for endemicity of Rhinosporidiosis:
    It has to be explained why this disease is endemic in certain parts of South India and in the dry zone of Srilanka. If stagnant water could be the reason then the chemical and physical characteristics of the water needs to be defined. In addition other aquatic organisms may also be playing an important synergistic reaction. This aspect need to be elucidated. Text book of microbilogy is repleate with examples of such synergism i.e. lactobacillus with trichomonas, and Wolbachia with filarial nematodes.




    These studies prompted Prof Ahluwallia et al to conclude that:


    1. Chronic inflammation almost always precedes rhinosporidiosis
    2. During this period if the patient consumes dry / fried tapioca and is malnourished it invariably leads to granulomatous polyp in the nose.
    3. Dirty pond water in which the patient takes bath causes inflammation of the nasal mucosa

      The following are the reasons making the study of this disease rather difficult:

      1. Till date no pure extract containing rhinosporidial trophozoite / spores / sporangium is available
      2. Attempts made to culture these organsim have not been successful
      3. The role of electron dense bodies in disease propagation is yet to be studied. Studies have shown that these electron dense bodies stain positively to Feulgen staining indicating that it contains nucleic acids
      4. The absence of good animal model for studying this disease is one major drawback.