[Venous thrombosis disclosing Marchiafava-Micheli disease].

It is established practice in patients with thromboembolic disease without the classical predisposing factors to search for general causes and abnormalities of blood clotting. The authors report a case of paroxysmal nocturnal hematuria or the Marchiafava-Micheli syndrome, a rare but classical cause of venous thrombosis. In this patient, the hemopathy presented with venous thrombosis.