PMC9751485_01
Magnetic resonance imaging (MRI) and positron emission tomography/computed tomography (PET/CT) scans of the brain. Intracranial lesion was not observed on the T2-weighted MRI scans (A). However, multiple nodular subcortical cerebellar enhancement [arrow in (B)] and meningeal enhancement [arrowhead in (B)] were observed on the contrast-enhanced T1-weighted MRI scan (B). Three-dimensional projection images of the fluorodeoxyglucose (FDG) uptake in a sagittal PET scan (C) and sagittal PET/CT scan (D) are shown. Absence of FDG uptake was indicative of cessation of the glucose metabolism in the brain tissue [arrow in (C)] when compared with the presence of FDG uptake in the cervical spinal cord [arrowhead in (C)], as observed in the PET/CT scans. A hollow skull or empty light bulb sign, a typical PET image of a brain-dead patient, was observed [arrow in (C)].
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Multiple nodular subcortical cerebellar enhancements and meningeal enhancements in the cerebellum and cervical spinal cord were observed on contrast magnetic resonance imaging (MRI; 1.5-T magnet, SIGNA Creator; GE Healthcare, Milwaukee, WI, USA) (Figures 1A,B). The PET/CT images showed an absence of FDG uptake in the intracranial structures (Figures 1C,D).