Figure 2.

A 66 year old man with a intraductal sessile tumour of the bile duct. The patient initially presented with upper abdominal pain. Ultrasonography showed bile duct dilatation. (A) Cholangiography showed a stenosis at the distal end of the bile duct (arrow). (B) A frame from intraductal ultrasonography showed the probe in the bile duct within the ultrasonographic field of view. Note the intraductal sessile tumour which invaded the pancreatic parenchyma (arrows). The narrow dot at the margin of the frame was 1.0 mm in width. Endoscopic transpapillary bile duct biopsy showed no evidence of malignancy. (C) The histological findings of the resected specimen showed cholangiocarcinoma which invaded the pancreatic parenchyma (arrowheads) (haematoxylin and eosin, ×2).