Types of placenta previa

Placenta previa is classified according to the placement of the placenta:

• Type I or low lying: The placenta encroaches the lower segment of the uterus but does not infringe on the cervical 
• Type II or marginal: The placenta touches, but does not cover, the top of the cervix.
• Type III or partial: The placenta partially covers the top of the cervix
• Type IV or complete: The placenta completely covers the top of the cervix