Distinction of hepatocellular carcinoma from benign entities such as focal nodular hyperplasia is important because failure of prompt diagnosis could result in a missed opportunity for curative resection. The differential deagnosis, especially among focal nodular hyperplasia and adenoma and even hepatocellualr carcinoma, may ve difficult; and when using inly a single imaging method, the diagnosis is often equivocal. Therefore, a combination of imaging modalities is preferred. For focal nodular hyperplasia, the combination of computerized tomography (CT ), magnetic resonance imaging (MRI), and radionuclide scintigraphy showed a high sensitivity and specificity. But , histologic examination is required for the differential diagnos is of hepatic mass . We report a case of hepat ocellular carcinoma without clinical evidence of malignancy or serum elevat ion of tumor marker , that mimicked the CT , MRI, and radionuclide scint igraphic appearance of focal nodular hyperplasia. (Korean J Hepatol 1998;4:393 398)
