Cor triatriatum sinister is a rare congenital anomaly in which a membrane divides LA into two distinct chambers, supramitral ring is another membrane dividing LA. Combination of both these defects is very rare and these occurring in tandem with complete situs inversus with associated VSD are rarer still. 12 year old female with h/o dyspnea and a systolic murmur presented with complete situs inversus with cor triatriatum sinister with supramitral ring with VSD. Cor triatriatum sinister and supramitral ring and complete situs inversus is a very rare congenial disorder that can be confused clinically with congenital mitral stenosis but can be adequately diagnosed with transthoracic echocardiography and surgical correction is the definitive cure for these anomalies although percutaneous approach can also be tried.