Sympus monopus accompanied by nephroblastoma--A case report.

An autopsy case of sirenomelia accompanied by nephroblastoma has been reported. In this case, there were many complicating anomalies such as left renal agenesis, absence of external genital organs, imperforate anus, mass of redundant skin over sacral region, two umbilical vessels, absence of great omentum and patent ductus arteriosus. We considered this malformation as sympus monopus.