Sonographic appearance of uterine scar dehiscence.

We describe the sonographic appearance of two cases of uterine scar separation in patients with prior cesarean deliveries. In the first case, the anteriorly located placenta appeared to be a placenta previa with accreta and in the second case the placenta was also located directly beneath the uterine scar thus masking a separation until the third stage of labor was complete. These two cases demonstrate an unusual sonographic and clinical presentation of uterine scar separation involving anteriorly located placentas.