Small bowel (small intestine)
Benign tumors and tumor-like conditions

Author: Hanni Gulwani, M.D. (see Authors page)

Revised: 16 February 2018, last major update August 2012

Copyright: (c) 2003-2018,, Inc.

PubMed Search: Endometriosis[TI] small bowel[TIAB]

Cite this page: Gulwani, H. Endometriosis. website. Accessed October 19th, 2018.
Definition / general
  • Endometrial glands, stroma and hemosiderin in small bowel
Clinical features
  • Mean age 44 years, range 28 - 56 years
  • Presents with pain, mass or incidental findings
  • May cause obstruction or mimic other diseases
  • Rarely complicated by neoplasms or precancerous changes (Am J Surg Pathol 2000;24:513)
  • Endometriosis associated tumors include endometrioid carcinoma, MMT (Hum Pathol 2000;31:456)
  • Alterations in N-cadherin expression may cause deep tissue invasion (Mod Pathol 2010;23:38)
Case reports
Gross description
  • Serosal and subserosal nodules < 5 cm
  • Smooth muscle hypertrophy
  • Gray cut surface with minute areas of hemorrhage
Microscopic (histologic) description
  • Endometrial glands, stroma (may show decidualization), hemosiderin in deeper layers
  • Fibrosis of bowel wall, neuronal hypertrophy (Am J Surg Pathol 2001;25:445)
  • Mucosal changes similar to those in Crohn's disease, prolapse, ischemia
Microscopic (histologic) images

Images hosted on other servers:

Various images

Positive stains
  • CD10 (endometrial stroma)