ORIGIN OF 1 PULMONARY ARTERY FROM AORTA

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Abstract
Two additional cases are reported in which the origin of one pulmonary artery is from the ascending aorta. The other pulmonary artery is supplied by the right ventricle. Embryologically, this anomaly seems to be a persistent partial truncus arteriosus. A review of the literature reveals only 13 other cases in which one pulmonary artery arises from the ascending aorta. As a result, one lung is subjected to systemic pressures and the opposite lung retains its normal pressure. The expected histologic changes from the altered hemodynamic conditions have not been demonstrated. Ten of the 11 lungs examined were identical morphologically and only 3 showed evidence of medial hypertrophy. These findings are not in concurrence with the experimental studies. The anomaly can be correctly diagnosed by angiogranhy and is surgically correctable.