Fig. 3

Ano-rectal junction descent with rectal intussusception. During rest, ano-rectal junction (red star) is at the level of PCL (a). During squeeze (b), there is slight decrease in ano-rectal angle. During strain, ano-rectal junction (red line) shows a descent of 4.2 cm (c). During the defecation phase, there is further descent of ano-rectal junction (red line) with rectal intussusception (white arrow in d)