Colon tumor
Mesenchymal tumors
Kaposi sarcoma

Author: Charanjeet Singh, M.D. (see Authors page)

Revised: 4 Jaunuary 2017, last major update May 2012

Copyright: (c) 2003-2017, PathologyOutlines.com, Inc.

PubMed Search: Kaposi’s sarcoma [title] colon

Cite this page: Kaposi sarcoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/colontumorkaposi.html. Accessed January 24th, 2017.
Definition / General
  • GI involvement in 50% - 80% with visceral involvement due to AIDS or in endemic areas of Africa
  • GI symptoms are rare (diarrhea, protein losing enteropathy and abdominal pain)
Case Reports
Clinical Images

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Kaposi sarcoma

Gross Description
  • Redish brown to purple macules or nodules 5 - 15 mm
Micro Description
  • Submucosal lesions similar to skin lesions
  • Expansion of lamina propria by spindle cells with mild / moderate atypia that obliterate muscularis mucosa
  • Extravasated red blood cells common
Micro Images

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Low power

High power

CD34

Positive Stains
Negative Stains
Differential Diagnosis