Nasal cavity, paranasal sinuses, nasopharynx

Inflammatory lesions

Antrochoanal polyps

Last author update: 1 November 2004
Last staff update: 3 November 2022

Copyright: 2004-2023,, Inc.

PubMed search: Nasal polyps antrochoanal

Nat Pernick, M.D.
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Cite this page: Pernick, N. Antrochoanal polyps. website. Accessed March 22nd, 2023.
Definition / general
  • 4 - 6% of nasal polyps
  • Frequently occur in childhood
  • 90% solitary
  • Arise from wall of maxillary antrum, extending through large primary or secondary maxillary ostium into nasal cavity
  • May pass into choanae or nasopharynx
Case reports
Gross description
  • Long narrow stalk with firm, fibrous body
Microscopic (histologic) description
  • Thin surface mucosa with no thickened basement membrane
  • Stroma with stellate cells, less edema and fewer glands than inflammatory polyp
  • May have prominent dilated vessels with thrombosis or infarct
  • Prominent eosinophils in only 20%
Microscopic (histologic) images

Case #390

Various images

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