Hepatocellular adenoma is a rare benign liver lesion and occurs especially in women of reproductive age. Patients with hepatic adenomas are generally asymptomatic. Spontaneous rupture and malignant degeneration are the main complications. Hepatocellular adenomas are usually detected incidentally with imaging modalities. 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) reflects cellular glucose metabolism. 18F-FDG PET/CT is commonly used in diagnosis, cancer staging, and evaluation of treatment response. Hepatocellular adenoma showing FDG uptake on PET is seen rarely and it may be confused with malignant liver lesions. In this case report, we present a case of hepatocellular adenoma mimicking metastasis on PET/CT, the importance of magnetic resonance imaging in diagnosis, and subtypes of hepatic adenomas