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FIG 6. 75-year-old man with secondary parkinsonism after bilateral putaminal hemorrhage.
A, T2-weighted image shows a large hyperintense area in the left putamen and a slitlike hyperintensity in the right putamen. Multiple spotty areas of hyperintensity are also seen in both putamen. The margins of the large area of hyperintensity and of the slitlike hyperintensity are hypointense owing to susceptibility effects resulting from the accumulation of iron (hemosiderin).
B, On T2-weighted image (3540/105) of the midbrain, the substantia nigra is not distinguishable. There are no abnormal signal changes in the midbrain.
C, On diffusion-weighted image, both substantia nigra are reduced in size. This image shows hyperintensity in the substantia nigra, which might reflect neuronal degeneration and gliosis.
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