dropping down of the rectum outside the anus.
Protrusion of the rectum through the anal canal, including the lining (mucosa) and muscles of the rectum. Mucosal prolapse is only the lining. Internal rectal prolapse occurs when the rectum telescopes upon itself but does not protrude out of the anus.
Extrusion of the rectal mucosa through the anus, may occur in children with heavy Trichuris trichiura infections; usually no sequelae after therapy.