Adult Cor Triatriatum Sinistrum as an Unusual Cause of Embolic Stroke

Cor Triatriatum Sinistrum is a congenital anomaly in which the left atrium is divided into 2 parts by a fold of tissue, a membrane, or a fibromuscular band. Classically, the proximal (upper or superior) portion of the left atrium receives the venous blood, whereas the distal (lower or inferior) portion is in contact with the atrioventricular valve and contains the atrial appendage and the true atrial septum that bears the fossa ovalis. The anomaly is almost always diagnosed in early childhood. The hemodynamics of the Cor Triatriatum are similar to that of mitral stenosis and the most common presenting symptoms in adults are dyspnea, hemoptysis and orthopnea as a result of the obstruction to blood flow.