PMC6434437_01
CT brain showing normal appearances.
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The CT brain was unremarkable (Figure 1). 
MRI brain showing a large ring enhancing lesion of the brainstem (arrow).
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Staged T2-weighted MRI scans showing a significant interval improvement in the intracranial appearance, with almost a complete resolution of the signal abnormality.
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There was a parallel resolution of radiological abnormalities (Figure 3).