Obstetricians may unexpectedly encounter placenta accreta in the third stage of labor during vaginal delivery. An inadvertent attempt to remove a retained placenta due to accreta at delivery may lead to uterine inversion or devastating postpartum hemorrhage (PPH) [1]. The risk factors of placenta accreta include but are not limited to previous uterine surgery and prior endometrial injuries secondary to inflammation, curettage or electric cauterization [2]. It remains a great challenge for obstetricians to suspect and identify placenta accreta occurring in a primigravida who has a lack of risk factors.
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