Heterotopic supradiaphragmatic liver formation in association with congenital cardiac anomalies. Heterotopic supradiaphragmatic liver formation is extremely rare. We studied a case of heterotopic liver in a 26-week fetus with severe cardiac and conotruncal anomalies. The cardiac anomalies are strikingly similar to those of a previously described patient with heterotopic supradiaphragmatic liver. The cardiac anomalies and heterotopic supradiaphragmatic liver formation may be mechanistically related. 