Fig. 1

Images of endoscopic retrograde cholangiography and MDCT of the distal bile duct. a Endoscopic retrograde cholangiography. Narrowing and wall-irregularity of the distal bile duct were found (arrow). b Abdominal MDCT. Wall thickness with contrast enhancement of the distal bile duct was identified (arrow). There was no invasion to the surrounding organs or vessels. MDCT, multi-detector computed tomography