Case report: Two cases of placenta previa terminated at 18 weeks' gestation.

Placenta previa is associated with increased maternal and fetal morbidity, caused primarily by hemorrhage, making an accurate diagnosis very important. However, diagnosis and treatment remain difficult, especially in the second trimester. We treated two cases with placenta previa at 18 weeks' gestation. In both patients, the cervical os was still closed when bleeding increased, necessitating emergency cesarean section. Postoperative course and the course of the subsequent pregnancy were uneventful. Terminating the pregnancy at the time of worsening of symptoms even in the second trimester should be considered as an option in the treatment of placenta previa.