title: Placental location in pregnancies following cesarean section.
abstract: Ultrasonic placentography was used to compare placental location in patients who had undergone previous Cesarean sections with those who had had vaginal deliveries. Results indicated that: (1) placental location was not influenced by existing uterine scars; (2) anterior uterine wall implantations occur with sufficient frequency (35%) to warrant ultrasonic placentography prior to third trimester amniocentesis for fetal maturity studies; and (3) lower anterior uterine segment implantations occur with sufficient frequency (8%) to warrant ultrasonic placentography prior to surgical entry of the lower uterine segment.
mesh_terms: D002585:Cesarean Section; D002921:Cicatrix; D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy; D014463:Ultrasonography; D014599:Uterus / Q000033:anatomy & histology