A middle-aged woman underwent a contrast CT to evaluate a palpable upper abdominal mass. The images showed large lesion in the left lobe of the liver, and malignancy was among differential diagnoses. For this reason, FDG PET/CT was performed. Surprisingly, the level of FDG uptake by the large hepatic lesion was similar to the normal part of the liver. Pathological examination demonstrated hepatic angiomyolipoma.