An unusual cause of a protuberant lesion of the gastric antrum.

A 58-year-old man presented to our hospital due to upper abdominal pain for 2 months. Gastroscopy showed a 1.5×1.5×1 cm3 protuberant lesion in the gastric antrum. Magnifying endoscopy with blue laser imaging showed roughly normal micro-surface and micro-vessel structure. Endoscopic ultrasonography showed the lesion originated from the muscularis propria, with low-density irregular cystic echo. Then the patient received treatment of gastrointestinal lesions with endoscopic submucosal dissection. During the operation, it could be seen that the lesion was mainly located in the submucosa, the local depth of which reached the muscularis mucosae. It was tan-white in color, with toughness and cystic tactile sensation. The operation went smoothly and his recovery was good. Pathological studies showed that pancreatic tissue was found in the lesion, which was composed of exocrine acini and ducts. Meanwhile, dilated cystic glands were found in the excised specimens. He was eventually diagnosed as ectopic pancreas in gastric antrum complicated with gastritis cystica profunda (GCP).