الفهرس 
NORMAL ANATOMY AND DEVELOPMENT OF THE PLACENTAOnly 14 pages are availabe for public view
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Abstract
• Ultrasonography is the primary screening modality for the identification of abnormal placentation, but magnetic resonance (MR) imaging is a complementary imaging modality that is useful when ultrasonography is inconclusive.
• As most patients referred for placental evaluation with MR imaging have suspicious findings on ultrasonography, the pretest probability for abnormalities on MR imaging is high.
• Imaging features useful for the diagnosis of abnormal placentation include placental lobulation with uterine contour bulge, interruption of the inner low signal-intensity myometrial layer, and placental heterogeneity resulting from dark intraplacental bands and abnormal vascularity on T2-weighted imaging.
• Reliably differentiating placenta accreta from increta and placenta increta from percreta is difficult, and often not possible.
• Antenatal diagnosis of placental abnormalities is critical in aiding the referring clinician to avoid or mitigate potential complications.