A 70-year-old man with a history of diabetes mellitus presented with weakness and poor oral intake for 1 month. On physical examination, he was febrile and had mild right upper quadrant tenderness. The patient's white cell count was 14,900/mm³, with 79.0% neutrophils. A chest radiograph showed an air-fluid level in the right-upper abdomen (Fig. 1). Computed tomography (CT) revealed a huge gas-forming liver abscess (Fig. 2). The patient underwent sonography-guided drainage, and was given intravenous antibiotics and insulin to control his diabetes. The culture of the pus grew Klebsiella pneumoniae. He recovered and was discharged.