In FESS for chronic rhinosinusitis, the middle meatal antrostomy primarily targets drainage and ventilation of the:

• A Frontal sinus via the frontal recess
• B Maxillary sinus via the natural ostium in the posterior fontanelle ✓
• C Sphenoid sinus via the sphenoethmoidal recess
• D Anterior ethmoid cells via the uncinate process removal

Explanation

Middle meatal antrostomy enlarges the natural ostium of the maxillary sinus located in the posterior fontanelle of the lateral nasal wall. This restores mucociliary drainage of the maxillary sinus, which physiologically drains toward the natural ostium irrespective of gravity. The frontal recess is addressed for frontal sinusitis. The sphenoethmoidal recess serves the sphenoid. Uncinate resection is a step in FESS that exposes the maxillary ostium.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.