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.