a case of complete unroofed coronary sinus syndrome combined with coronary sinus stenosis leading to asymptomatic presentation

We describe a patient with an asymptomatic complete unroofed coronary sinus (cs) syndrome associated with the cs stenosis in the absence of a persistent left superior vena cava (svc) as identified on coronary computed tomography angiography. there was a large defect between the cs and the left atrium (i.e. a large left-to-right shunt), but an unusual combination of the absence of a persistent left svc (i.e. no risk for brain abscess due to the absence of a right-to-left shunt) and the cs stenosis (i.e. a markedly reduced degree of a left-to-right shunt), resulting in an asymptomatic presentation.