Unusual location of an atrial myxoma complicated by a secundum atrial septal defect.

Myxomas occur most commonly in the left atrium arising from the fossa ovalis. We report the case of a left atrial myxoma originating from the base of the right inferior pulmonary vein. This large myxoma filled a large secundum atrial septal defect, which was diagnosed intraoperatively. The unusual position of this myxoma and operative management of the associated atrial septal defect are discussed.