Prenatal diagnosis of dicephalic conjoined twins: report of a case.

Dicephalus is one of the rarest types of conjoined twins. In such cases, the twins are usually stillborn or die shortly after birth. Termination of the pregnancy is recommended if conjoined twins are diagnosed early in the second trimester. A case of dicephalic conjoined twins with cystic hygroma diagnosed prenatally by ultrasound at 16 weeks' gestation is presented. The ultrasonographic findings, management and pathology are discussed.