Abstract
The historical background and delineation of the clinical features in the various types of extracardiac arteriovenous aneurysms within the thorax are described. To illustrate each type, there are presented detailed reports of three unusual cases: 1. 1. Rupture of the aorta into the pulmonary artery: clinically diagnosed, verified by intracardiac catheterization, and made unusual by long survival. 2. 2. Rupture of the aorta into the superior vena cava: clinically diagnosed, proved by oxygen content of venous blood at various sites, and confirmed at autopsy. 3. 3. Pulmonary arteriovenous fistulas: the second reported case complicated by subacute bacterial endarteritis, which was eradicated by heavy penicillin therapy. Later, lobectomy and dissection of two smaller lesions in other lobes cured the condition. Newer techniques of radiological examination, including planimetry and angiocardiography, determination of oxygen content of peripheral venous blood, and intracardiac catheterization, are now available in suitable cases to aid in the diagnosis. Intensification of the classical murmur on inspiration was noted in each of our three cases and needs further, study as a possible diagnostic clue.
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