[Focal nodular hyperplasia (author's transl)].

Focal nodular hyperplasia was diagnosed angiographically in 14 patients and confirmed histologically. Differentiation of this benign lesion from other space-occupying diseases of the liver can be very difficult, since focal nodular hyperplasia produces a variable angiographic appearance. The typical angiogram showing radial vessels in the arterial phase and sharply demarcated foci in the parenchyma phase is found in only one third of patients. Angiographic differential diagnosis includes adenomas and carcinomas of the liver. Resection of the tumours in case of malignant tumours is not indicated. Foci at the margin of the liver, or if they are pedunculated, should be removed in case of spontaneous perforation. Tumours in the centre of the liver should be observed (computer tomography). Oral contraceptives stimulate the growth of these foci. They may diminish in size after stopping these drugs. 70% of cases of focal nodular hyperplasia remain clinically silent and were discovered accidentally or at autopsy.