Another condition associated with internal intussusception is colitis cystica profunda (also known as CCP, or proctitis cystica profunda), which is cystica profunda in the rectum. Cystica profunda is characterized by formation of mucin cysts in the muscle layers of the gut lining, and it can occur anywhere along the gastrointestinal tract. When it occurs in the rectum, some believe to be an interchangeable diagnosis with SRUS since the histologic features of the conditions overlap. Indeed, CCP is managed identically to SRUS.