A CT scan performed before FESS shows an ethmoid air cell pneumatizing along the floor of the orbit, projecting into the roof of the maxillary sinus. This cell narrows the infundibulum and complicates a middle meatal antrostomy. What is this anatomical variant called?

• A Agger nasi cell
• B Concha bullosa
• C Onodi cell
• D Haller cell ✓

Explanation

A Haller cell is an infraorbital ethmoid air cell that pneumatizes into the orbital floor and forms the roof of the maxillary sinus. It can narrow the maxillary ostium and infundibulum and must be removed during antrostomy if it obstructs drainage. The agger nasi cell lies anterior to the frontal recess, the Onodi cell lies lateral and superior to the sphenoid around the optic nerve, and a concha bullosa is a pneumatized middle turbinate.

Reference: Cummings Otolaryngology Head and Neck Surgery, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.