Please, please seek a second opinion about the hysterectomy. The long term effects of a hysterectomy are massive and not to be taken lightly. there is a video on youtube called Female Anatomy: Before and After Hysterectomy
watch it and then use it to inform yourself of the long term effects and use that information to ask your Dr more questions. there might be another way.
I agree with the second opinion in regards to the hysterectomy. have you had a previous section or other uterine surgery? is that where the accreta is?
grade 4 PP's do not move enough from the opening of the cervix to enable a vaginal birth.
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