Role of magnetic resonance defecography in the assessment of obstructed defecation syndrome

Figure 10  Rectal intussusception. A: In the first patient, the anorectal junction (orange star) is above the pubococcygeal line (PCL) at rest; B: During the defecation phase, the anorectal junction descends caudally below the PCL (orange line). There is associated formation of three mucosal intussusceptions along the posterior wall of the rectum (yellow arrows); C: In the second patient, the anorectal junction is above the PCL at rest (orange star); D: During defecation, the anorectal junction descends below the PCL (orange star), with an associated full-thickness rectal intussusception (yellow arrows). Note the presence of an enterocele (green star) and peritoneocele (yellow star).