Conclusion
Coexistence of subaortic membrane and persistence SVCs is a very rare finding. Diagnosis of dilated coronary sinus can be easily confirmed by saline contrast echocardiography. When a dilated coronary sinus is present on echocardiography, it may be a clue towards the possibility of PLSVC. The role of noninvasive approaches in cardiac imaging such as echocardiography, cardiac CT and MRI should be considered for the diagnosis of both subaortic membrane and PLSVC. Persistence of both superior vena cava (SVCs) with subaortic membrane is very rarely seen but multi-model cardiac imaging can help to make accurate diagnosis.