Abstract

Congenital hydronephrosis is relatively common abdominal mass in infants and children. But report of congenital hydronephrosis in twin was not found. We have experienced case of congenital giant hydronephrosis in a male twin pair. Twin A at 3 years of age and twin B at 4 years of age, who had huge abdominal mass on the left side. So we have reported them with the clinical, radiological and pathological findings and reviewed references.