Twin to Twin Transfusion Syndrome (TTTS) and other complications of monochorionic (shared placenta) twin pregnancies like unequal placental sharing are generally diagnosed by ultrasound.

• 双胞胎输血综合症以及其他单绒毛膜双胞胎怀孕的并发症，比如胎盘分配不均等，一般都是通过超声诊断的。