Antrochoanal Polyp vs Ethmoidal Polyp

Rhinology Short Questions in ENT Mnemonics in ENT

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🧠 Differences between Antrochoanal Polyp and Ethmoidal Polyp

Feature	Antrochoanal Polyp	Ethmoidal Polyp
Origin	Maxillary sinus (antrum)	Ethmoidal air cells
Laterality	Usually unilateral	Typically bilateral
Number	Single polyp	Multiple polyps
Age Group	More common in children and young adults	More common in adults
Direction of Growth	Grows posteriorly toward choana & nasopharynx	Confined to nasal cavity, may reach nares
Etiology	Infective	Allergic
Shape & Size	Trilobate: antral, nasal, and choanal parts	Grape-like clusters
Histology	Lacks eosinophils; edematous stroma	Shows eosinophilic infiltration
Endoscopic Appearance	Single smooth pedunculated mass	Multiple glistening grape-like masses
CT Scan Findings	Maxillary sinus opacification; widened ostium	Multiple soft-tissue densities in ethmoid region
Treatment	Surgical excision (FESS or Caldwell-Luc)	Medical (steroids); Surgery if needed (FESS)
Recurrence	Low (if completely excised)	High (if allergy not controlled)

🧠 Mnemonic to Remember

"A Single Max Choosy Child vs Both Ethical Adults"

▶️ Antrochoanal Polyp:

A Single → Single polyp
Max → Arises from Maxillary sinus
Choosy → Grows toward choana
Child → Seen in children/young adults

▶️ Ethmoidal Polyp:

Both → Bilateral
Ethical → Arises from ethmoid air cells
Adults → Seen in adults

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