Question: what is type 1 placenta previa?
Answer: Placenta praevia occurs in four grades, ranging from minor to major: Grade 1 – (minor) the placenta is mainly in the upper part of the womb, but some extends to the lower part. Grade 2 – (marginal) the placenta reaches the cervix, but doesn't cover it. Grade 3 – (major) the placenta partially covers the cervix.