Figure 4 Magnetic resonance imaging (MRI) characteristics in central placenta previa patients with and without placenta accreta (Sagittal T2-weighted). (Microsoft Office PowerPoint 2007, Microsoft, USA). (A) Central placenta previa with placenta accrete: Placenta thickness is 12.3 centimeters; The cervical canal is almost completely eroded by the placenta and we can hardly see a clear cervix; The placental signal is heterogeneous and many dark T2 bands are seen in the placenta (white arrow); The whole placenta is located in the lower part of the uterus, which is dilated; A partial myometrium defect can be seen at the uterine and placental interface (white circle); (B) Central placenta previa without placenta accrete: Placenta thickness is 3.2 centimeters; We can see a clear cervix (white arrow); Placenta signals are homogeneous; The boundary between the uterine myometrium and placenta is clear (red arrow).