Dissecting aneurysm of the pulmonary artery is a rare (1 : 3000) but life threatening complication of the use of Swan-Ganz catheters. The most typical clinical manifestation is hemoptysis, even a asymptomatic aneurysm causes pathognomonic X-ray findings. The eventually long free intervall between catheterisation and formation of the dissecting aneurysm requires thorough follow up of the concerning patients, e. g. chest roentgenograms and thorax CT-scans. The endovascular therapy of this lesion has replaced surgery due to a much better risk profile. The aim of the endovascular treatment is a coil-occlusion of the parent artery immediately proximal to the aneurysm. The success of this procedure will be instantaneously evident.