Postulated causes of perinatal death include hydrops, dystocia, tumor rupture, preterm labor secondary to polyhydramnios, and anemia due either to hemorrhage or hemolysis within the tumor.

• 引起产前胎儿死亡机制包括有胎儿心衰竭、早产、难产、肿瘤破裂而造成的大量出血；