A patient with refractory maxillary sinus disease undergoes CT evaluation. Images reveal an accessory ethmoid air cell located inferior to the orbit and superomedial to the maxillary sinus, lying along the infraorbital canal and narrowing the infundibulum. This cell is termed:

• A Haller cell ✓
• B Onodi cell
• C Agger nasi cell
• D Suprabullar cell

Explanation

C Haller cell, or infraorbital ethmoid cell, pneumatizes along the floor of the orbit into the roof of the maxillary sinus beside the infraorbital canal. When large, it narrows the maxillary ostium and infundibulum and contributes to recalcitrant maxillary sinusitis, so it is removed during FESS. An agger nasi cell lies anterior to the frontal recess, an Onodi cell pneumatizes superolateral to the sphenoid around the optic nerve, and a suprabullar cell sits above the ethmoid bulla in the frontal recess region.

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

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.