[Spontaneous perforation of a syphilitic aneurysm of the aortic arch into the pulmonary artery].

An aortopulmonary fistula in case of a bag-shaped aneurysm of the aortic arch is demonstrated via angiography. A diagnosis to the effect that the existence of this phenomenon is suspected, can already be arrived at when examining the plain radiography of the thorax. We can say that a sign of an aortopulmonary fistula is represented, in case of an aneurysm of the aorta ascendens and of the arcus aortae, by the existence of a left-right shunt with hypercirculation in the pulmonary circulation, in most cases also signs of right ventricular insufficiency. This is often combined with a typical previous history of sudden dyspnea and thoracic pain. The article points out the theoretical possibility of balloon catheter occlusion of the fistula to relieve the acute right ventricular load.