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Fig 1. T2 signal-intensity alterations in a 37-year-old asymptomatic family member. Subtle high-signal-intensity lesions in the corticospinal tracts under the motor cortex (A), in the posterior limb of the internal capsule (B, arrow), mesencephalon (C, arrow), pons (D, arrow), and medulla oblongata (E, arrow). Only a tiny signal-intensity abnormality is seen in the right corticospinal tract at the level of the pons. Note the lesions in the upper cerebellar peduncles (C, arrowhead). Fluid-attenuated inversion recovery (FLAIR), 10,000/140/2500.
