FIG 5. 19-year-old man with secondary parkinsonism (carbon monoxide intoxication) 3 years after onset.

A, On T2-weighted axial image (3540/105), a hyperintense lesion (arrow) is observed in the globus pallidus; a result of carbon monoxide poisoning.

B, Diffusion-weighted axial image of the midbrain shows atrophy of both substantia nigra (arrow). The signal intensity is relatively higher than that in the control subjects.