Endoscopically treated gastritis cystica polyposa JS Park, S-J Myung, H-Y Jung, et al. VOLUME 54, NO. 1, 2001 GASTROINTESTINAL ENDOSCOPY 101 From the Departments of Internal Medicine, Diagnostic Pathology, Radiology, and the University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea. Reprint requests: Seung-Jae Myung, MD, Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap-dong, Songpa-gu, Seoul, 138-736, Korea. Copyright © 2001 by the American Society for Gastrointestinal Endoscopy 0016-5107/2001/$35.00 + 0 37/4/114412 doi:10.1067/mge.2001.114412 Endoscopic treatment of gastritis cystica polyposa found in an unoperated stomach Ju Sang Park, MD, Seung-Jae Myung, MD, Hwoon-Yong Jung, MD, Suk-Kyun Yang, MD, Weon-Seon Hong, MD, Jin-Ho Kim, MD, Gyeong Hoon Kang, MD, Hyun Kwon Ha, MD,Young II Min, MD Gastritis cystica polyposa (GCP), characterized by polypoid hyperplasia of the gastric mucosa, is an uncommon lesion that develops in patients who have undergone gastroenterostomy with or without gastric resection. 1,2 Endoscopically and radiological- ly GCP appears as a polypoid mass that is almost always on the gastric side of the anastomosis. This lesion is rarely found in an unoperated stomach. 1,3,4 Because it is difficult to differentiate GCP from can- cer both radiologically and endoscopically, surgery is required in most cases for diagnosis. 1,2 This is a case of GCP with unusual morphologic features that occurred in an unoperated stomach. The patient was treated successfully by endoscopic polypectomy. CASE REPORT A 44-year-old woman had complained of intermittent epigastric pain for 3 years. One month before admission EGD performed at another hospital identified a large polypoid mass in the fundus of the stomach. There was no history of gastrectomy or gastroenterostomy. Laboratory studies including liver and renal function tests were with- in the normal range. EGD at our hospital revealed a pedunculated polyp approximately 4 cm in diameter and erythematous mucosa with a lobulated contour along the anterior wall of the fundus. The surface of the polyp appeared slightly bluish and transparent (Fig. 1A), suggesting a cystic structure. The polyp was movable but there was no evi- dence of bleeding. EUS demonstrated a homogeneous, hypoechoic, and multilocular cystic mass with a stalk (Fig. 1B); no solid component was seen. Biopsy speci- mens from the surface of the polyp revealed only moder- ate chronic gastritis with mild atrophy and intestinal metaplasia. Contrast-enhanced abdominal CT disclosed an intralu- minal polypoid mass with a thick peripheral wall and multiple cystic components along the greater curvature of