猪股 英俊, 白松 文彦, 辰口 治樹, 三谷 環, 伊東 佳澄, 三谷 正信, 平田 健一郎, 吉田 茂夫

Hidetoshi INOMATA, Fumihiko SHIRAMATSU, Haruki TATSUGUCHI, Tamaki MlTANI, Kasumi ITOH, Masanobu MlTANI, Kenichirou HIRATA, Shigeo YOSHIDA

札幌医科大学付属病院機器診断部

Department of Diagnostic Ultrasound and ME Sapporo Medical University

キーワード : Common bile duct dilatation, Endoscopic ultrasonography, Floating gallbladder, Torsion of gallbladder

Although floating gallbladder occurs in approximately 4% of the population, it is seldom diagnosed with ultrasonography. Here we report a case of a floating gallbladder in which the abdominal ultrasonogram showed echo-free space in front of the portal vein and inferior vena cava. It was first misdiagnosed as a dilated common bile duct. Endoscopic ultrasonography and other imaging methods were useful in making a correct diagnosis. It is important to rule out a floating gallbladder when diagnosing a dilated common bile duct.