2024 Volume 66 Issue 3 Pages 279-285
A 46-year-old female patient presented to our hospital for close examination and treatment after a rectal mass was observed during a CS performed at another hospital. On repeat CS, we observed a 10-mm, submucosal, tumor-like mass in the lower rectum. EUS showed a 10-mm hypoechoic tumor located in the submucosa. We performed ESD because the boring biopsy specimens showed nonspecific pathologic findings. Pathological examination of the resected lesion confirmed the diagnosis of colitis cystica profunda.