Congenital anomaly 01 IVC is ra re, but und erstand ing of this ano ll1aly is important in radio logical diagnosis, angiographic procedures and major retroperitoneal and thoracic su rgeryWe analysed 23 cases of IVC interruption diagnosed by cardiac angiography at Seou l Na tional Unive rsity HospitalThe res ults we re as lo ll ows 1. The incidence of infrahepatic interru ption of IVC was 0.4 5% oi lhe pati ents having cardiac angiography and most patients showed cya nosis (91%) 2. Th e 1l1 0st cO ll1 mon assoc iated ca rdiac anoma ly was right ventricular outflow lract obstructio n (60%). Other assoc iated ca rd iac delects were VSD, ASD, va lvul ar ano m alies in 9 cases (39'Y,) respecti vely; doubl e o utl et right ventricle, bilateral superior vena cava, single ventricle in 6 cases (26'l(,) respectively; single atrium. PDA in 5 cases (22%) respective ly 6 cases of situs inversus, 3 cases of situs ambigu us, 2 cases of viscera l heterotax ia and one case of asplen ia were obse rved a l s。 7 cases 01 lelt-s ided IVC were assoc iated w ith IVC interruption in normal situ s

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