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FIG 4. 67-year-old man with Parkinson's disease (Hoehn and Yahr scale, 4).
A, On T2-weighted image (3540/105), the substantia nigra is difficult to identify. There are no abnormal signal changes in the midbrain.
B, On diffusion-weighted image, the substantia nigra (arrow) is depicted clearly as a crescent of low signal intensity. No atrophy of the substantia nigra is seen.
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