What does it mean that the lower edge of the placenta is adjacent to the internal opening of the cer

Placenta previa is a marginal placenta. The placenta normally attaches to the lower part of the cervix. Placenta previa occurs when the placenta attaches below the lower part of the cervix and reaches or covers part of the cervix. According to the specific attachment position of placenta, placenta previa is divided into marginal placenta previa, central placenta previa and partial placenta previa. Among them, marginal placenta previa is the mildest kind of placenta previa. The main harm of placenta previa is that it is easy to show repeated painless vaginal bleeding in the middle and late stages of pregnancy. Generally speaking, the larger the coverage area, the earlier the bleeding occurs, and the greater the bleeding volume. Marginal placenta previa, bleeding time is relatively late, bleeding volume is also relatively small.