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 fall between the rectum and the vagina.
Sigmoidocele
Enterocele
Diverticulum
Pseudomeningocele
Lymphocele
Anal fissure
Perineal hernia
Rectocele