of rectal contents.
* Bulge in posterior (back) wall of vagina.

Causes

The phenomenon is caused by a weak section of fascial supports of the vagina (the uterosacral cardinal ligament complex and rectal vaginal septum), which allows a section of peritoneum containing the sigmoid colon to prolapse out of normal position and descend between the rectum and the vagina.

The mesentery of the sigmoid colon (the structure which attaches the colon to the abdominal

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