After fecal diversion, nonspecific colitis may be seen in the defunctionalized colon. The purpose of this prospective study is to identify specific findings that could help in the differential diagnosis between diversion colitis and other inflammatory bowel diseases in order to avoid inappropriate diagnosis and therapy. It was studied, prospectively, thirteen consecutive patients from two public hospitals of Rio de Janeiro who had undergone temporary colostomy for indications other than inflammatory bowel disease. They were submitted to endoscopy with biopsy of both proximal and distal colorectal segments, and prospectively evaluated before and after restoration of intestinal continuity. Endoscopy with biopsy of both proximal and distal excluded colorectal segments showed a nonspecific mucosal and submucosal inflammation, resembling ulcerative colitis ( p < 0.01). There was endoscopic resolution in all patients once restoration of intestinal continuity was established (p < 0.01) and also histologic improvement after the stoma closure. In conclusion there are no specific findings that make possible an unequivocal distinction between diversion colitis and other nonspecific inflammatory diseases. Diagnosis should be achieved if after stoma closure occur remission of endoscopic large bowel inflammatory signs with improvement in mucosal histologic appearance and prompt relief of clinical complaints.
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