73-year-old man with left hemiparesis.

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Presentation transcript:

73-year-old man with left hemiparesis. 73-year-old man with left hemiparesis. The first MR examination (left column) was performed 23 hours after the onset of symptoms, the second MR examination (middle column) was performed on the second day, and the third MR examination (right column) 1 week after stroke. Top row, Unenhanced T1-weighted images (600/14/1) are normal on the first and second days, but at 1 week, slightly increased signal intensity is observed in the cortex due to microhemorrhage or cortical laminar necrosis.Middle row, Contrast-enhanced T1-weighted images (600/14/1) show intravascular enhancement over the infarct on the first day. Mild cortical enhancement is detected on the second day, progressing to intensive cortical enhancement at 1 week.Bottom row, Diffusion-weighted trace images (4000/103/1, in raw image acquisition) show the extent of infarcted tissue as areas of increased signal intensity in the territory of the right middle cerebral artery. Jari O. Karonen et al. AJNR Am J Neuroradiol 2001;22:103-111 ©2001 by American Society of Neuroradiology