Ultrasonographic diagnosis of thoracopagus conjoined twins in a monoamniotic triplet gestation

Ultrasonographic examination at 16 weeks 5 days' gestation diagnosed a mono amniotic triplet gestation complicated by thoracopagus conjoined twins. Aft er pregnancy termination, the ultrasonographic diagnoses were confirmed by pathologic examination. In reporting the first ultrasonographically diagnos ed monamniotic triplets with conjoined twins, we demonstrate that a systema tic evaluation by twin-derived ultrasonographic techniques may permit corre ct diagnosis of unusual triplet pregnancies.