Abstract
In a 46-year-old man with Zollinger-Ellison syndrome, multiple imaging studies were
negative for a primary gastrinoma. Preoperative endoscopic ultrasonography (EUS) revealed
a 3.3-cm mass which appeared to be in the pancreatic head. During surgery, a celiac
lymph node of the size of the mass seen by EUS was found, but the pancreatic head
also felt firm and was suspicious for a mass. After resection of the celiac node,
intraoperative EUS revealed no mass in the pancreatic head. Based upon intraoperative
EUS findings, the pancreatic head was not resected. Histologic evidence of gastrinoma
was found in the celiac lymph node and a 4 to 5 mm nodule in the duodenal wall. Postoperatively
serum gastrin levels returned to normal.