Fig. 3
From: A case of duodenal duplication cyst mimicking a pancreatic pseudocyst with intracystic hemorrhage
a Macroscopically, a cystic mass of 5 cm in size was adjacent to the second part of the duodenum on the pancreas side and was close to the ampulla. b Microscopically, the wall of the cyst was composed of gastric mucosa and shared a common proper muscle layer with the duodenum. DL indicates the side of the duodenal lumen, and DC indicates the side of duplication cyst (H&E × 1.1). c Magnified view of the yellow frame area in b. Chronic ulcers and erosions were seen in the cyst (H&E × 40). d Magnified view of the black frame area in b. Ectopic gastric mucosa was observed in non-ulcerative region (H&E × 100)