First trimester diagnosis of dicephalic parapagus conjoined twins via transvaginal ultrasonography.

Conjoined twins are rare, and most cases are thoracopagus. Parapagus conjoined twins (one body with two heads) are extremely rare. We report a case of dicephalic parapagus twins that was diagnosed in the first trimester at 10 weeks via transvaginal ultrasonography. Copyright 2005 Wiley Periodicals, Inc