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Focal Nodular Hyperplasia of the Liver

4 case reports are presented. In 2 cases the focal nodular hyperplasia lesions were in children aged 6 and 7 years. In 3 instances an upper abdominal mass had been present. The other tumor was found on arteriographic studies done for other reasons. Photomicrographic reproductions are shown. There were no histories of steroid therapy. All tumors were resected and histologic findings confirmed the diagnoses. 1 patient died at the surgical operation to remove the tumor. Anomalous and increased arterial supply has been associated with the development of focal nodular hyperplasia of the liver. This was demonstrated in 2 of the cases. The lesion may be due to injury secondary to increased pressure in the sinusoids and portal vein branches from chronic exposure to arterial pressure. Focal hepatic injury with ischemia atrophy fibrosis and regenerative hyperplasia are thought to be the sequence of events. The lesions have been shown to be benign with a 5- and 6-year follow-up in 2 of the cases.