Two cases of intrahepatic gallstones with stenosis of the common hepatic duct caused by overriding of the right hepatic artery are described. The probable diagnosis of the compression of the bile duct by the artery was obtained by superimposing a direct cholangiogram on an angiogram. The final diagnosis was made at operation. The first patient was successfully treated by resection of the compressed common hepatic duct with Roux-en-Y hepaticojejunostomy anterior to the right hepatic artery. In the second patient, lateral segmentectomy and cholangiojejunostomy were performed.Arterial anomalies are not infrequent findings during biliary surgery. Variations in position of the cystic or hepatic arteries are well known. It is, however, very rarely reported that the extrahepatic bile duct is compressed by such arteries [I-5].Recently, the present authors experienced 2 cases of intrahepatic gallstones with stenosis of the common hepatic duct, which was caused by overriding of the right hepatic artery. The purposes of this paper are to report these rare cases and to discuss the significance of compression of the biliary tract by the right hepatic artery.

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