Silent Persistent Left Superior Vena Cava Right-to-Left Shunt as a Unique Cause of Recurrent Brain Abscesses.

We present a novel case of recurrent brain abscesses found to be the result of a silent congenital right-to-left extracardiac shunt, a persistent left superior vena cava draining into the left atrium. The patient's brain abscess was evacuated surgically and treated with antibiotics, and his shunt was subsequently repaired. The case suggests that attention should be paid to evaluation for shunt physiology allowing for bypass of the pulmonary circulation in those with recurrent brain abscesses.