Magnetic resonance imaging of the pelvic floor.

Magnetic resonance imaging is a novel noninvasive imaging modality for the assessment of pelvic floor dysfunction. It relies on static sequences with a high spatial resolution to study muscle morphology (levator ani) and fast imaging dynamic sequences during contraction, rest, and straining. Prolapse of the various pelvic compartments is detected with respect to organ position relative to the pubococcygeal line during dynamic phases. Compared with clinical examination, its input appears to be especially invaluable in the posterior compartments (peritoneal and digestive) and to assess complex prolapses involving more than one pelvic compartment. It is also useful for understanding postsurgical recurrences.