A 52-year-old man from Delhi presents with a 3-month history of right upper quadrant pain and jaundice. Imaging reveals a 4 cm solitary mass in hepatic segment VII with no evidence of cirrhosis or portal hypertension. The mass is hyperenhancing in the arterial phase and shows washout in the portal venous phase on contrast-enhanced CT. AFP is 8 ng/mL and liver function tests show mild elevation of transaminases. What is the most appropriate next step in management?