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[A Case of Hepatectomy for Primary Hepatic Neuroendocrine Tumor, Preoperatively Diagnosed with Hepatocellular Carcinoma].

A 65-year-old man has pointed out a hepatic tumor when he was rushed to the hospital because of disturbance of consciousness associated with hypoglycemia. Abdominal dynamic CT images showed a tumor, 2.5 cm in diameter, in S2/3 close to the umbilical portion of the portal vein, and it had enhancement in the arterial phase and became washout in the portal phase. We performed left lateral segmentectomy with a diagnosis of hepatocellular carcinoma. The tumor was histopathologically diagnosed as a Grade 1 neuroendocrine tumor(NET). As additional examinations could not detect a primary lesion in any other site, the tumor was considered as a primary hepatic NET(PHNET). PHNETs are rare and because of the possibility that an unknown primary lesion exists, we have to observe for years carefully.