Oncocytic liver cell adenoma.

A 46-year-old woman underwent right hepatic lobectomy for the removal of a solitary liver tumour from a non-cirrhotic liver. The macroscopic and light microscopic features were those of a liver cell adenoma but the cells appeared oncocytic. Electron microscopy confirmed the numerous mitochondria characteristic of oncocytes. The difficulty of distinguishing oncocytic liver cell adenoma from fibrolamellar hepatocellular carcinoma is discussed.