An autopsy case of pseudosarcoma of the common bile duct.

An autopsy case of pseudosarcoma in the common bile duct is reported. An 82-year-old Japanese male complaining of jaundice was admitted to our hospital; he was examined by abdominal ultrasonography (US), revealing biliary calculus, dilatation of the common bile duct, and choledocholithiasis, considered to be the possible cause of the obstructive jaundice. Endoscopic retrograde biliary drainage (ERBD) and cholangioscopy were performed concurrently, revealing a vaguely whitish tumor near the papilla of Vater. Two months later, the patient died from complications of the liver, infection, and disseminated intravascular coagulation (DIC). An autopsy study revealed tumor cells with extreme pleomorphic changes, growing diffusely, very like sarcoma. Further examination revealed epithelioid arrangements in the metastatic lymph node. Twelve kinds of immunohistochemical examination showed a positive reaction, reflecting the presence of an epithelioid cytoskeleton. Of 28 cases of true and pseudosarcoma of the biliary system reported in the Japanese literature, only 1 case was reported, in 1990, to involve the common bile duct. We therefore report the present case of pseudosarcoma of the common bile duct.