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MR defecogram study showing excessive (>4 cm) descent of the perineum during straining, typical of the Descending Perineum Syndrome (White line= Pubococcygeal line). Reproduced, with permission, from Roos J, Weishaput D, Wildermuth S, Willmann J, Marincek B, Hilfiker P, Experience of 4 Years with Open MR Defecography: Pictorial Review of Anorectal Anatomy and Disease, Radiographics, 2002, 22, 828.
