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Background: The aim of this work is to assess the diagnostic accuracy of MR defecography in ano-rectal dysfunction [ARD] for proper treatment planning. Results: MR defecography was done to 30 patients with ARD for detection of its functional and structural causes. Increased perineal descent was detected in 70% of cases, rectocele in 46.7%, rectal intussusception in 40%, cystocele in 26.7%, uterine prolapse in 27.7%, enterocele in 13.3%, and paradoxical puborectalis contraction in 30%. Conclusion: MR defecography is an essential diagnostic tool for optimum management of ano-rectal dysfunction patients.