Pulmonary artery thrombosis associated with anomalous pulmonary venous connection: an unusual complication following the modified Fontan procedure.

The presence of unrecognized partial anomalous pulmonary venous connection may cause complications of pulmonary infarction and right-to-left shunting in patients undergoing the modified Fontan procedure. These complications can be prevented by identification of any anomalous pulmonary venous connection at preoperative cardiac catheterization.