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Cerebral MRI axial PD/T2weighted (a, b) and coronal FLAIR (c, d) sequences showing small bilateral aspecific white matter lesions (a, c) involving the frontal white matter (red arrows) and sparing the basal ganglia (b, d). (e) Axial and coronal cerebral FDG PET revealing a metabolic decrease in the brainstem (pons and mesencephalon) and medial temporal cortex (red arrows).
