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A 27-year-old male was referred to our institution for further evaluation of persistent rectal bleeding. A prior colonoscopy showed a sigmoid soft tissue lesion, and pathology revealed chronic active colitis and granulation tissue with ulcers and focal adenomatous changes. We performed a flexible sigmoidoscopy that showed a 4.5-cm multilobulated polypoid lesion approximately 45 cm from the anal verge (Figure 1). A 20 MHz Olympus endoscopic ultrasound (EUS) miniprobe showed hypoechoic lesion with cystic/spongy features involving the mucosa and submucosa (Figure 2). These features were thought to suggest colitis cystica profunda (CCP). Histologic examination of snare biopsies identified dilated glands with mucinous content, surrounded by variable degrees of fibrosis on a background of interspersed chronic inflammatory cells, with few colonic mucosal crypts and mild inflammatory cell infiltrate (Figure 3). The patient was instructed to follow up with gastroenterology if bleeding recurred.

Endosonographic Findings in Colitis Cystica Profunda