Comparative study of transperineal and transabdominal sonography in the diagnosis of placenta previa.

Aim: To assess the role of transperineal sonography (TPS) in the diagnosis of placenta previa in the third trimester and to compare it with transabdominal sonography (TAS).

Methods: Seventy-five suspected cases of placenta previa were subjected to TAS with half full bladder and to the TPS with empty bladder to visualize the inner surface of the cervix and inferior edge of the placenta. The presence or absence of placenta previa was confirmed at delivery.