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Diffusion MRI is a hyper-fast technique for evaluation of molecular movement of water, which is reduced in some conditions, namely acute stroke.This technique is nearly 100% accurate in the diagnosis of areas of acute cerebral infarction.  This patient presented with acute findings suggesting a stroke, which worsened over a two day period. Imaging demonstrates an acute stroke in evolution with subsequent extension. (a) Day 1 diffusion MRI demonstrates a small cortical a sub-cortical infarct. When clinical condition worsens, (b) day 2 DWI demonstrates enlargement of the stroke. (c) Perfusion MRI demonstrates areas of reduced blood flow corresponding to final infarct size. These scanning techniques provide valuable information regarding the region of ischemia which maybe salvageable with thrombolytic therapy.
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