Combined superior vena cava and pulmonary artery obstruction by an ascending aortic aneurysm.

A case report is presented on the use of intravenous radioisotope angiocardiography in the diagnosis of an atherosclerotic aneurysm of the ascending aorta in a 44-year-old man who presented with mild superior vena cava obstruction. In addition to outlining the site and extent of the aneurysm, intravenous Tc-99m-albumin radioisotope angiocardiography and blood pool imaging permitted demonstration of the site of obstruction of the cava, indicated the presence of venous collateral channels bringing about delayed filling of the right heart, and also detected obstruction of the right pulmonary artery by the aneurysm. The procedure is simple, rapid, and entirely noninvasive and permits both anatomic and hemodynamic evaluation of the abnormality.