Which histologic findings suggest the etiology in lower gastrointestinal (GI) bleeding (LGIB)?

Updated: Jul 26, 2019
  • Author: Burt Cagir, MD, FACS; Chief Editor: BS Anand, MD  more...
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Answer

Most colonic diverticula are false pulsion diverticula and are composed only of mucosa and submucosa that has herniated through the colonic wall musculature. Hemorrhage associated with diverticula comes from perforated vasa rectae located at the neck or the apex of the diverticula.

Colonic angiodysplasias are vascular ectasias commonly located on the right side of the colon. Microscopically, vascular ectasia consists of dilated thin-walled venules and capillaries localized in the submucosa of the colonic wall.


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