Focal nodular hyperplasia (FNH) is a rare benign hepatic tumor occurring predominantly in women of childbearing age. Generally oral contraceptive is not associated with FNH but might accentuate the vascular abnormalities which may cause the lesion to enlarge and, very rarely, to rupture. FNH is typically asymptomatic and seldom bleeds. Often it is incidentally observed during imaging procedures performed for some other reasons. The histologic feature of FNH is characterized by areas of localized growth of mature hepatocytes and septal fibrosis. Surgical resection is seldom required because of the benign nature of the lesion and its lack of significant complication. We experienced a case of focal nodular hyperplasia without liver cirrhosis confirmed by surgical resection and histologic examination. in a 47-year-old man. (Korean J Hepatol 2000 ;6 :524 - 529)
