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Objective: We sought to determine the importance of histopathological assessment in patients with chronic diarrhoea who had macroscopically normal colonic endoscopies. Methods: Of 300 consecutive patients undergoing colonoscopy by one endoscopist during a five year period, biopsies were taken in 200 cases of unexplained diarrhoea of at least 6 weeks and their colorectal mucosa appeared macroscopically normal. All biopsies were reviewed by one pathologist. Results: Of the 200 patients enrolled, 36 (18%) cases were classified as unremarkable histopathological diagnosis and 164 (82%) cases showed histopathological changes: 121 (73.78%) non-specific inflammation, 19 (11.58%) ulcerative colitis, 11 (6.7%) collagenous colitis, 7 (4.26%) lymphocytic colitis, and 6 (3.65%) bilharzial colitis. Conclusion: We conclude that the role of biopsies in chronic diarrhoea patients with grossly normal colon at endoscopy is high as yielding a histological diagnosis in 21.5% of patients is so benefit to them as they may had modified the therapy received after identification of a specific cause as collagenous colitis, lymphocytic colitis, ulcerative colitis and bilharzial colitis. So Patients should be subject to colonoscopy and biopsy to aid specific diagnoses.

Role of Mucosal Colonic Biopsy in Patients with Chronic Unexplained Diarrhoea who their Colonoscopy is Normal