THE NORMAL NASAL CAVITY  
ACCESSORY MAXILLARY SINUS OSTIUM (RIGHT)

ACCESSORY MAXILLARY SINUS OSTIUM (RIGHT)

Description : The natural ostium of the maxillary sinus is hidden behind the posterior and inferior portion of the uncinate process and cannot be seen during a diagnostic endoscopic examination. Accessory maxillary sinus ostia located in the anterior or posterior nasal fontanelles are not infrequently seen in the middle meatus.

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