Persistent left superior vena cava and partial anomalous pulmonary venous connection: incidental diagnosis by transesophageal echocardiography during coronary artery bypass surgery.

Transesophageal echocardiography plays an important role in the intraoperative treatment of the heart surgery patient. Its utility in the description of both known and unexpected cardiac pathology is well established. We describe a patient with a previously undiagnosed partial anomalous pulmonary venous connection along with a persistent left superior vena cava scheduled for routine coronary artery bypass graft surgery (CABG).