Abstract
Cor triatriatum dexter (CTD) is a rare congenital heart disease resulting from persistence of the right valve of the sinus venosus. The persistent valve forms a membrane that divides the right atrium into a proximal and a distal chamber. This disorder exhibits varying clinical manifestations depending on the degree of partitioning or septation of the right atrium. In asymptomatic patients, the disease may be discovered during surgical procedures, diagnostic testing such as echocardiography, or hemodynamic monitoring. Severe septation abnormalities may cause right-sided heart failure and elevated central venous pressures due to obstruction of the tricuspid valve, right ventricular outflow tract, or inferior vena cava. Here we report a case of CTD in a patient presenting with symptoms of dyspnea and fatigue, followed by a short discussion of the embryology and clinical implications of this congenital disease, as well as current advances in management.