A rectocele is a bulging of the front wall of the rectum into the back wall of the vagina. Other pelvic organs can bulge into the vagina, including the bladder (cystocele) and the small intestines (enterocele), producing similar problems. Rectoceles are usually caused by thinning.
A posterior vaginal wall prolapse occurs when the thin wall of tissue that separates the rectum from the vagina weakens, allowing the vaginal wall to bulge. Posterior vaginal prolapse is also called a rectocele (REK-toe-seel). A small posterior vaginal prolapse (rectocele) may.
When the walls of the vagina become lax, the organs that they should be supporting bulge into the vagina, creating the sensation of a lump.