Advances in Imaging for Placenta Accreta Spectrum Disorder.

Placenta accreta spectrum (PAS) is a disorder secondary to abnormal development of placental trophoblasts, resulting in invasion of the maternal uterine tissue beneath the placenta. The incidence of PAS continues to rise as a result of several factors, with the most common being the increasing number of cesarean deliveries. The diagnosis of PAS carries significant increased risk of maternal morbidity and mortality from maternal hemorrhage, surgical complications, and need for critical care services. Accurate prenatal diagnosis is critical to ensure optimized resources and surgical planning before delivery. Advances in ultrasonography, magnetic resonance imaging, and computed tomography, which have improved antenatal diagnosis, are described in this article.