Definition: Diversion colitis (DC) is a localized, relatively benign, iatrogenic condition which occurs in almost 100% of diverted colonic segments in patients who undergo ileostomy/colostomy for various reasons.

Synopsis

 prominent follicular lymphoid hyperplasia (100%)
 chronic mucosal inflammation (100%)
 acute mucosal inflammation (78%)
 Paneth cell metaplasia (26%)
 mild goblet cell depletion (22%)
 foci of colonic cryptitis (13%)
 colonic crypt abscesses (13%)
 mild colonic mucosal architectural distortion (22%)
 colonic mucosal aggregates of eosinophils (43%)

References

 Vujanic GM, Dojcinov SD. Diversion colitis in children: an iatrogenic appendix vermiformis? Histopathology. 2000 Jan;36(1):41-6. PMID: #10632750#