Placental location in pregnancies following Cesarean section

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Abstract
Ultrasonic placentography1–4 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.

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