Sonographic findings in the prenatal diagnosis of cephalothoracopagus syncephalus. A case report.

The ultrasonic intrauterine diagnosis of cephalothoracopagus, a form of conjoined twinning, can be made when a monochorionic monoamniotic gestation contains a single head and torso accompanied by eight limbs. This is the second reported case of the syncephalus variety of cephalothoracopagus twins associated with clomiphene citrate use; however, the association is believed to be coincidental rather than causative.