Small intestine & ampulla

Benign tumors / tumor-like conditions


Topic Completed: 1 August 2012

Minor changes: 19 November 2020

Copyright: 2003-2021,, Inc.

PubMed Search: Leiomyoma[TI] small bowel full text[sb]

Hanni Gulwani, M.B.B.S.
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Cite this page: Gulwani H. Leiomyoma. website. Accessed December 6th, 2021.
Definition / general
  • Benign smooth muscle tumors that arise from small bowel muscularis propria or muscular mucosa
  • Duodenal leiomyomas of muscular mucosa are incidental, 1 - 2 mm, merge with muscularis mucosa; those not from muscularis mucosa are also often incidental but larger, 2 - 4 cm, with firm, white, whorled cut surface
Microscopic (histologic) description
  • Low cellularity, no / rare mitotic figures, resembles esophageal leiomyoma
Microscopic (histologic) images

AFIP images

Esophageal leiomyomas

Positive stains
Negative stains
Differential diagnosis
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