1Department of Internal Medicine, Fujita Health University School of Medicine, 2Department of Surgery, Fujita Health University School of Medicine, 3Department of Internal Medicine, Meijyo Hospital, 42nd Department of Internal Medicine, Nagoya University
Islet cell tumor, Small pancreatic cancer, Endoscopic ultrasonography
We examined two cases of a small pancreatic tumor. One was a nonfunctioning islet cell tumor (6 mm) at the body of the pancreas, and the other was a duct cell carcinoma (8 mm) at the body of the pancreas. The ultrasonographic features of the two cases were evaluated by endoscopic ultrasonography (EUS). In benign islet cell tumor, a margin was distinct with lateral shadow and posterior enhancement. The contour was smooth and the internal echo pattern was hypoechoic with a homogenous central echogenic portion. However, in small pancreatic ductal adenocarcinoma, the margin was indistinct, the contour was irregular, and the internal echo pattern was hypoechoic with an irregular, central echogenic portion. The results suggest the EUS is a useful modality for the differential diagnosis in small pancreatic mass lesions because EUS provides characteristic sonograms of the pancreatic tumors.