We report a case of biloma which was developed by communication between the biliary tract and the retention cyst in the post hepatectomy patient, following percutaneous microwave coagulation therapy (MCT) for hepatocellular carcinoma (HCC).
The patient developed retention cyst after posterior segmentectomy of the liver for hemangioma in 1986. About 7 years later, HCC of 2 cm in diameter was revealed adjacent to the cyst. Although surgical resection was technically possible, the patient chose to undergo MCT. He had an attack of fever approximately one year after MCT. Investigation revealed biloma that was developed from retention cyst by communication between the biliary tract and the cyst. Then we performed surgical resection of the biloma together with the recurrent HCC neighboring the cyst.