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.
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