A 45-year-old man with a large hepatocellular carcinoma in the right lobe who underwent right hepatic lobectomy 2 years and 6 months ago. Since this time he has been well, with no evidence of recurrence (group I). CT Scan obtained during the delayed phase shows a low attenuating mass with an irregular but sharply circumscribed border. The central irregular area of low attenuation represents necrosis.