A case report is presented of the prenatal diagnosis of conjoined twins at
10 weeks and 2 days' gestation using three-dimensional ultrasound (3D US).
The multiplanar display coupled with 3D US surface rendering clearly confir
med the Presence of craniopagus. The twins were facing in opposite directio
ns with the left occipital region of one embryo fused with the left parieta
l-temporal region of the other. Additional multiplanar analysis above the l
evel of the biparietal diameter demonstrated brain sharing.