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Placental Invasion

Accreta - up to myometrium
Increta - into myometrium
Percreta - through myometrium

Placenta Previa

Implants in the lower uterine segment near os
Painless bleeding
Marginal previa if placenta comes within 1 cm of internal os

Vaso Previa

Vessels course over internal os

Placental Abruption

Premature separation of uterus from placenta
Often painful bleeding