Cor triatriatum sinister with dilated coronary sinus from persistent left superior vena cava: a novel operative approach.

Persistent left superior vena cava is known to be associated with cor triatriatum. The persistent left superior vena cava drains into a dilated coronary sinus and can cause left atrial outflow obstruction by impinging on the posterior wall of the left atrium. Residual obstruction can persist, even after surgical resection of the cor triatriatum membrane. We describe a novel surgical treatment in a patient with cor triatriatum and persistent left superior vena cava.