[A rare cause of spontaneous haemoperitoneum: rupture of an aneurysm due to fibromuscular dysplasis (author's transl)].

The authors report the case of a patient presenting with an acute haemoperitoneum. Angiography after surgery led to a diagnosis of fibro-muscular dysplasia. They stress the rarity of this aetiology in the development of haemoperitoneum, perhaps related to the small number of angiographic studies made after surgery.