两个精子与一个卵子受精时产生部分性葡萄胎。结果是三倍体（69XXY）。仅有一些绒毛呈葡萄状，胎儿可以存在，但很少活过15周。
This is a partial mole that occurs when two sperms fertilize a single ovum. The result is triploidy (69 XXY). Only some of the villi are grape- like, and a fetus can be present, but rarely survives past 15 weeks.