Background A 64-year-old woman presented to the emergency room with a 3-month history of intermittent abdominal cramps, accompanied by nausea, vomiting, anorexia, and decreased bowel movements ...

Imaging tests, such as computed tomography (CT) scan or ultrasound, can also be used to find and diagnose an insulinoma. Zollinger-Ellison syndrome (ZES) is a rare digestive disease caused by a tumor ...

Since such gastrin measurements are strong indicators of a gastrin producing tumor, for example, a gastrinoma, some patients without a history of ulcers or signs of a multiple endocrine dysplasia ...