Abstract
A 67-year-old man was referred to our hospital for investigation of a hepatic tumor. He had undergone cholecystectomy at age 38 years and was HCV-Ab positive. Dynamic CT scan revealed a mass in the hepatic portal region, which showed vascular enhancement. Angiography showed a collateral artery arising from the left hepatic artery to supply the right hepatic lobe, and absence of a right hepatic artery. An 8 mm aneurysm arising from the collateral artery was detected. As the collateral artery was narrow, transcatheter arterial embolization could not be undertaken. At surgery, the aneurysm was detected on the right side of the umbilical portion of the liver, and was treated by ligation. Pathological examination showed hypertrophy of the tunica intima and atrophy of the tunica media. A pathological diagnosis of idiopathic pseudoaneurysm was made. We report herein a rare case of a collateral hepatic artery aneurysm treated by ligation.
