Granular cell tumors of biliary ducts. Report of two cases and review of the literature.

There were two cases of granular cell tumor of the extrahepatic biliary system; to our knowledge, 17 have previously been reported. The initial symptoms most often are those of biliary colic. The majority of the patients are black and female. The cystic duct and the common bile duct are most commonly involved. Additional biliary pathologic disorder is present in more than half of the patients.