Ectopic pancreas at the ampulla of Vater diagnosed with endoscopic snare papillectomy: A case report and review of literature

Figure 1 Magnetic resonance cholangiopancreatography showing the dilated common bile duct and pancreatic duct with abrupt cut-off at the ampulla.

Figure 2 Endoscopic snare papillectomy. A: Endoscopic view of the sub-epithelial ampullary lesion; B: Cholangiogram showing terminal common bile duct (CBD) stricture with upstream dilated CBD after selective CBD cannulation; C: Endoscopic view showing snaring of the papilla while pulling back the expanded balloon within the CBD towards the duodenal lumen; D: Endoscopic view after endoscopic snare papillectomy; E: Endoscopic view of the biliary sphincterotomy and pancreatic stent in place.

Figure 3 Ectopic pancreas at the ampulla of Vater–histopathology. A: Hematoxylin and eosin (HE) staining showing ampullary mucosa with ectopic pancreatic tissue (arrow) on low power view; B: Ampullary mucosa with inflammatory infiltrates in the lamina propria; C: HE staining showing ectopic exocrine pancreatic tissue (arrows) (20 ×); D: Pancreatic acini (40 ×).