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FIG 5. Signal intensity changes in the precentral gyri of a 50-year-old woman with definite ALS (clinically moderate UMN signs).
A–D, Adjacent T2-weighted FSE images (A and B) and corresponding FLAIR images (C and D) show a curvilinear hypointensity (closed arrows) in the region of the motor cortex of the precentral gyrus. In the subcortical white matter of the precentral gyrus, and extending toward the superior frontal gyrus, faint hyperintensity (open arrows) is detected on the FLAIR images but not on the FSE images.
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