- Complete: egg lacks nucleus, then gets fertilized. Vasculature of placenta looks like a cluster of white grapes. These are hydropic vessles and are diagnostic of gestational trophoblastic disease (GTD).
- Partial: Two sperm fertilize one egg-->3 chromos/pair
Both can lead to choriocarcinoma and must be treated with chemo, but most common with complete.
Usually seen in late 1st, early 2nd TM aeb dark "prune juice" bleeding.