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Figure 5b. False-negative susceptibility sign in a patient with acute proximal occlusion of MCA. (a) Transverse echo-planar T2*-weighted MR image (0.8/29) shows no susceptibility sign. (b) Coronal MR angiogram shows MCA occlusion (arrow) proximal to divisional bifurcation. (c) Transverse DW image (4,000/100; b = 1,000 sec/mm2) obtained at the frontoparietal region shows a large acute infarct (arrows) involving MCA territory. (d) Perfusion time-to-peak map obtained at the same level as c (2,000/60) shows a matched volume of abnormal perfusion (arrows).
