This is a case report of a liver cell adenoma occurring in a 2-year-old boy with no history of drug use. He was admitted for gradual abdominal distension and the presence of a tumor. Investigation revealed a slight elevation of serum α-fetoprotein, but the other liver function parameters were normal. CT showed a right lobe hepatic tumor with central necrosis, and <99m>Tc phytate liver scintigram revealed slight positive tracer localization in the tumor. Extended right hepatic lobectomy was performed, and a tumor measuring 9×7×7.5cm, and consisting of several cords and sheets of well differentiated hepatocytes without bile ducts or portal triad, was found. These findings were compatible with liver cell adenoma. Electron microscopy findings are also reported.