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The pelvic floor lies low at rest. As evacuation progresses, there is circumferential infolding of the full thickness of the upper and mid rectal walls into the low rectum, anal canal and finally beyond the anal verge. There is also a moderate-sized anterior rectocele with paste trapped within due to the intussusception. Small bowel loops are also seen to descend into the pelvic cavity, in keeping with an enterocele.