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FIG 5. Transient ischemic attack and chronic infarct in a 90-year-old woman with a remote history of cerebral infarct, scanned 2 hours after developing right-sided weakness and left-sided facial droop. Her symptoms resolved spontaneously within 11 hours.
A, Diffusion-weighted image with b = 1000 s/mm2 negative for acute infarcts, though a low-signal area of increased diffusion, consistent with chronic infarct, is noted in the right occipital lobe.
B, Diffusion-weighted image at b = 2500 s/mm2 demonstrates the low-signal lesion with greater contrast.
C, Diffusion-weighted image at b = 3000 s/mm2 also demonstrates this lesion more clearly than at b = 1000.
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