鈴井　 紀子¹, 中澤　 三郎¹, 山雄　 健次¹, 芳野　 純治¹, 乾　 和郎¹, 山近　 仁¹, 渡辺　 健一¹, 朝倉　 直子¹, 松本　 純夫², 水野　 有朋², 木本　 英三³, 三竹　 正弘⁴

Noriko SUZUI¹, Saburo NAKAZAWA¹, Kenji YAMAO¹, Junji YOSINO¹, Kazuo INUI¹, Hitoshi YAMACHIKA¹, Kenichi WATANABE¹, Naoko ASAKURA¹, Sumio MATUMOTO², Yuuhou MIZUNO², Eizou KIMOTO³, Masahiro MITAKE⁴

¹藤田保健衛生大学第2病院内科, ²藤田保健衛生大学第2病院外科, ³名城病院内科, ⁴名古屋大学第2内科

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

キーワード : 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.