Right pulmonary artery-to-left atrial fistula.

Right pulmonary artery-to-left atrial fistula is a rare congenital anomaly. Contrast echocardiography and cardiac catheterization diagnosed a right pulmonary artery-to-left atrial fistula in a 24-year-old female with a history of cyanosis since childhood, and recurrent thromboembolism. She underwent successful surgical closure of the fistula.