The authors report a case of a tumour of the liver in a pregnant woman who had taken oral contraception for six years. Since oral contraceptives have become far more widely used the two benign tumours of the liver, namely a hepatocellular adenoma of the liver and focal nodular hyperplasia, have become far more common. The increased blood supply to the liver can make such a tumour symptomatic and increase the risk of it rupturing intraperitoneally, especially at the onset of labour. A course of management has been suggested according to the size of the tumour and the duration of the pregnancy.