A Rare Collision Tumor Composed of Follicular Lymphoma and Adenocarcinoma in the Ampulla of Vater: A Case Report

Figure 1

Magnetic resonance cholangiopancreatography showing dilated intrahepatic and extrahepatic bile ducts including the cystic duct and the gallbladder. The common bile duct measures 15 mm in diameter with abrupt concentric stenosis in its lower third and a cut-off point located 20 mm distally to the duodenal ampulla (arrow). The pancreatic duct is depicted as normal.