During endoscopic frontal sinusotomy, which air cell forms the anterior boundary of the frontal recess and must be removed to achieve adequate frontal sinus drainage?
- A Agger nasi cell ✓
- B Ethmoid bulla
- C Supraorbital ethmoid cell
- D Anterior buttress of the middle turbinate
Correct answer: A. Agger nasi cell
Explanation
The agger nasi cell is the most anterior ethmoid cell, pneumatizing the lacrimal bone just anteroinferior to the attachment of the middle turbinate. It forms the anterior and inferior limit of the frontal recess, so its removal widens the recess and improves frontal drainage. The ethmoid bulla is posterior to the frontal recess, a concha bullosa involves the turbinate itself, and the supraorbital ethmoid cell lies posterolateral to the frontal sinus proper.
Reference: Stammberger, Functional Endoscopic Sinus Surgery, Revised ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.