PMC9520482_01
Magnetic resonance imaging findings. At time of diagnosis, brain MRI DWI and ADC sequences (transverse) showed no suspicious signal alterations (A, B). Four months after onset, T2 and ADC sequences showed obvious high signals on the left midbrain interpeduncular fossa (highlighted by arrows) (C, D). One year later, T2 and T2-flair sequences (transverse) showed midbrain lesions disappeared. (E, F).
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Besides, brain MRI showed no apparent abnormalities ( Figures 1A, B  ). 24h video electroencephalogram revealed sharp waves and slow spike waves were emitted from both temporal sides during waking and sleeping stages. T2 and ADC showed abnormal high signals on the left midbrain interpeduncular fossa ( Figures 1C, D  ). In July 2022, a repeated brain MRI showed midbrain lesions disappeared. ( Figures 1E, F  ).