Benign hepatocellular tumors: a regional survey

A survey of benign hepatocellular tumors in a metropolitan area included six cases of hepatocellular adenoma, eight of focal nodular hyperplasia, and two of nodular transformation. Two thirds of the adenomas occurred in women using oral contraceptives; two had life-threatening complications. The focal nodular hyperplasias were generally asymptomatic tumors occurring in patients over a wide age range and apparently not related to oral contraceptive use. The two cases of nodular transformation were incidental findings in patients having abdominal surgery. One of them had used oral contraceptives.