Origin of the right coronary artery from the descending thoracic aorta: angiographic diagnosis and unique coronary artery anatomy at autopsy.

An infant born at term with hypoplastic left heart syndrome was found angiographically to have an anomalous artery arising from the descending thoracic aorta which supplied the posterior and right coronary branches. Morphologically, the right coronary artery had atypical and striking elastotic changes and wall thickening.