| Features | Antrochoanal Polypi | Ethmoidal Polypi |
| Age | Common in children | Common in adults |
| Aetiology | Infection | Allergy or multifactorial |
| Number | Solitary | Multiple |
| Laterality | Unilateral | Bilateral |
| Origin | Maxillary sinus near the ostium | Ethmoidal sinuses, uncinate process, middle turbinate & middle meatus |
| Growth | Grows backwards to the choana; may hang down behind the soft palate | Mostly grow anteriorly and may present at the nares |
| Size & Shape | Trilobed with antral, nasal and choanal parts. Choanal part may protrude through the choana and fill the nasopharynx, obstructing both sides | Usually small and grape-like masses |
| Recurrence | Uncommon, if removed completely | Common |
| Treatment | Polypectomy; Endoscopic removal or Caldwell-Luc operation if recurrent | Polypectomy; Endoscopic surgery or ethmoidectomy (which may be intranasal, extranasal or transantral) |
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