Two cases of encapsulated spontaneous neuroma in the extrahepatic bile duct.

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Two cases having no history of laparotomy or abdominal injury were operated due to a stenosis of the extrahepatic bile duct and gallstones. They had no jaundice or right hypochondraligia. The stenosis was made by submucosal tumors; a white nodule in one case which extended from the confluence of the cystic duct to 7 mm toward the liver and 20 mm toward the duodenum, occupying the 2/3 of the bile duct, and a protruding tumor in the other case which located at 5 mm toward the duodenum from the confluence of the cystic duct occupying the right half of the bile duct. The latter case had stones in the intrahepatic and hepatic ducts, too. The histological study on the tumors revealed a proliferation of the nerve fiber confined in the perineurium which did not have damage. Although there exist reports on the amputation neuroma after cholecystectomy, there have been no reports regarding the encapsulated spontaneous neuroma in the extrahepatic bile duct.
社団法人日本肝臓学会の論文