Antrochoanal polyp (Killian's polyp) differs from ethmoidal nasal polyps in that it:
- A Is bilateral and associated with asthma and aspirin sensitivity
- B Is a malignant polyp requiring adjuvant radiotherapy
- C Arises from the maxillary sinus and has a bilobed structure extending to the choana ✓
- D Contains predominantly eosinophils and responds to topical corticosteroids
Correct answer: C. Arises from the maxillary sinus and has a bilobed structure extending to the choana
Explanation
Antrochoanal polyp (Killian's polyp) is a unilateral solitary polyp arising from the mucosa of the maxillary sinus (usually its posterior wall or floor). It has a bilobed structure — one part in the nasal cavity and one part in the nasopharynx behind the choana. Unlike ethmoidal polyps, it is unilateral, non-eosinophilic, not associated with atopy, and does not respond to steroids. Treatment is endoscopic removal through the middle meatus with marsupialisation of the antral cyst.
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.