Garofalo A, Pilloni E, Alemanno MG, et al. - Researchers examined whether ultrasound can accurately lead to prenatal diagnosis of placenta accrete spectrum disorders in patients with posterior placenta previa. In addition, they investigated how prenatal diagnosis influences the population of 198 women with posterior placenta previa. The women underwent transabdominal and transvaginal ultrasound examinations (Grey-scale and colour/power Doppler). For diagnosing placenta accreta spectrum disorders, detection of at least two of the following criteria was a requisite: loss of retroplacental clear zone, interruption of uterine serosa–bladder wall interface, turbulent placental lacunae with high velocity flow, myometrial thickness < 1 mm, increased vascularity of uterine serosa–bladder wall interface, loss of vascular arch parallel to basal plate and/or irregular intraplacental vascularization. At delivery with caesarean section, they made a definitive diagnosis. Placenta accreta spectrum disorders were revealed in 20/198 cases. Data gained indicated that for detecting placenta accreta spectrum disorders on posterior placenta previa, grey-scale and Color-Doppler ultrasound evaluation have high specificity, positive and negative predictive value, but low sensitivity. Nevertheless, they recommend encouraging an antenatal diagnosis of placenta accreta spectrum disorders for posterior placenta previa.