RESUMEN
BACKGROUND/AIMS: A surgical shunt closure via the lumen of an intrahepatic portal aneurysm was successfully performed in a 70-year-old Japanese woman with hepatic encephalopathy due to hyperammonemia. She had a 4-month history of repeated hepatic encephalopathy which persisted after treatment with oral medicine. Color Doppler ultrasonography and computed tomography revealed a cystic peripheral portal aneurysm, 4 cm in diameter, connecting the posterior branch of the portal vein to the short hepatic vein in the right lobe. METHODS: While performing the Pringle maneuver and clamping the inferior vena cava below the liver, the wall of the portal aneurysm was opened, and the site of inflow from the portal vein and the site of outflow to the hepatic vein via the lumen of the portal aneurysm were closed with interrupted sutures. RESULTS: The patient's postoperative course was uneventful, and she was discharged 12 days after surgery. 12 months after surgery, she had no recurrence of hyperammonemia or hepatic encephalopathy. CONCLUSION: Surgical shunt closure via the lumen of a portal aneurysm can be performed safely, easily, and completely with good vision.