Magnetic Resonance Defecography for Obstructed Defecation.

Magnetic resonance defecography (MRD) is a recommended study in the evaluation of patients with symptoms of obstructed defecation. MRD is unique in its ability to diagnose structural and functional abnormalities of the pelvic floor and provides detailed anatomic assessment to guide management. This article reviews MRD technique and limitations, normal anatomy, functional interpretation, and common pathology seen in patients with obstructed defecation and other pelvic floor disorders.