Fig. 1From: Surgical resection of mixed neuroendocrine-non-neuroendocrine neoplasm in the biliary system: a report of two casesPreoperative examination. a Endoscopy revealed an ulcerative lesion in ampulla of Vater. b Contrast-enhanced CT showed a 1.5-cm enhancing nodule around papilla of Vater. c, d EUS suggested that the tumor may have invaded the pancreatic parenchyma. CT, computed tomography; EUS, endoscopic ultrasoundBack to article page