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An extremely rare case of intrapancreatic bile duct metastasis from sigmoid colon adenocarcinoma is herein presented. Sigmoid colon cancer (T3, N0, M0, stage IIA) had been diagnosed and treated by sigmoidectomy in October 1993. In December 2002, a liver metastasis with intrabiliary growth was found, and this was treated by extended right hepatic lobectomy and caudate lobectomy with extrahepatic bile duct resection. In February 2014, intrapancreatic bile duct metastasis was found, and this was treated by subtotal stomach-preserving pancreatoduodenectomy. The intrapancreatic metastasis was judged to have arisen from cancer cell implantation, either by spontaneous shedding of cancer cells or as a complication of percutaneous transhepatic biliary drainage. Twelve months have passed since the last surgical intervention, and there has been no sign of local recurrence or distant metastasis. Differential diagnosis between intrahepatic cholangiocarcinoma and intrabiliary growth of a liver metastasis originating from colorectal adenocarcinoma is difficult but very important for determining the therapeutic strategy. Careful examination is needed to diagnose intrahepatic biliary dilatation, especially for patients with a history of carcinoma in the digestive tract and even if years have passed since curative resection of the digestive tract cancer. Aggressive surgical management for localized recurrence of a hepatic metastasis from colorectal adenocarcinoma may improve patient survival.

Intrapancreatic bile duct metastasis from colon cancer after resection of liver metastasis with intrabiliary growth: a case report