Right-sided superior vena cava draining into the left atrium in a patient with persistent left-sided superior vena cava emptying into the right atrium diagnosed by echocardiography.

We present a patient with an isolated right-sided superior vena cava draining into the left atrium with a persistent left-sided superior vena cava emptying into the right atrium. During an agitated saline injection into the patient's right upper extremity intravenous line, the patient suffered an acute transient ischemic attack. To our knowledge, this is the only reported case of this rare anomaly incidentally uncovered during an echocardiogram with saline contrast study.