Healthy Notes

Placenta Previa  Definition Placenta previa is a placental implantation abnormality in which the placenta is partially or completely implanted in the lower uterine segment , thereby covering the internal os of the cervix. Classification / Types Placenta previa is classified into four main types based on the degree of coverage of the cervical os: Type I (Minor): Low-Lying Placenta Placenta is implanted in the lower uterine segment but does not reach the internal os. Type II (Marginal) The lower edge of the placenta reaches the internal os but does not cover it. Type III (Partial) The placenta partially covers the internal os. Type IV (Major/Complete) The placenta completely covers the internal os. 🔴 Types III and IV are considered major placenta previa and are more likely to require cesarean delivery. Incidence Occurs in approximately 0.3–0.5% of all pregnancies . More common with: Multiparity Advanced maternal age (...