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Fig. 6B. —Abruption versus placenta previa in patient at 30 weeks' gestational age with placenta previa, bleeding, and pain. Because placenta previa typically does not cause pain but abruption does, clinical question was how large a retroplacental clot was present. With large abruption, plan was to deliver immediately. Sagittal T1-weighted MR image (TR/TE, 137/4.1; field of view, 240 x 320; matrix, 128 x 256; flip angle, 80°; acquisition time, 17 sec) obtained immediately after sonogram shows to better advantage small clot (solid arrow) above internal os (open arrow), with most of placenta (P) well attached. Finding allowed patient to be treated expectantly.