Fluoroscopy - Evacuation proctography
Frontal
Lateral
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Normal anatomy of rectum and anus at rest.
On anal contraction, good elevation of the rectum and anus.
On evacuation:
- rapid and complete rectal evacuation
- descent of 4 cm of the recto-anal junction
- intra-anal intussusception of the rectum and prolapse of a small bowel loop, which halts at the rectosigmoid junction