A Case of Prenatally Diagnosed Cephalopagus

Conjoined twin rarely occurs in human, with a reported incidence of 1:50,000 to 1:100,000 pregnancies. The site and extent of fusion are infinitely variable. Classification systems for conjoined twins are usually based on the fused anatomic region. The early prenatal diagnosis and assessment for shared vital organs are desirable for optimal obstetrical counseling and management. When severe forms are diagnosed prior to 24 weeks, pregnancy termination via vaginal delivery can be considered. With the advent of ultrasound, prenatal diagnosis is possible during the late first trimester or early second trimester. We report a case of cephalopagus diagnosed prenatally by ultrasonogram in the second trimester and subsequently was terminated, with a brief review of literature.