When the placenta is implanted partially (or completely) in the lower uterine segment, it is called placenta previa. Which kind of placenta previa is the most dangerous type?

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Type 2
Type 1 (or low lying placenta previa) presents as the major part of the placenta attached to the upper segment, with only the lower margin encroaching onto the lower segment-but not upto the os. On the other hand, Type 2 (or posterior placenta previa) is the most dangerous of all types of placenta previa. Type 2 is characterized as the placenta reaching the margin of the internal os, but not covering it.

When the Placenta Is Implanted Partially (Or Completely) in the Lower