PMC4051797_01
Brain magnetic resonance imaging (MRI) findings.. Notes: (A and B) MRI (diffusion-weighted image) on admission; (C and D) MRI (diffusion-weighted image) on hospital day 22; (E and F) MRI (diffusion-weighted image) on hospital day 36; and (G and H) MRI (diffusion-weighted image) on hospital day 66. Figures in the top set (A, C, E, and G) are images at the cerebral level of corona radiata. Figures in the bottom set (B, D, F, and H) are images at the cerebral level of lenticular nuclei. "R" indicates the right side of the patient's brain.
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Brain computed tomography (CT) on admission showed a mild low-density area in the right occipital lobe, and brain magnetic resonance imaging (MRI) (T2-weighted and diffusion-weighted images [Figures 1A and B]) showed a high-intensity area in the right occipital lobe. The high-intensity lesion on diffusion-weighted MRI had extended to the right parietal and temporal lobes by hospital day 22 (Figures 1C and D), then, in parallel with the clinical symptoms, it disappeared by hospital day 36 (Figures 1E and F). Episodes of this unusual visual phenomenon occurred intermittently for a few weeks, while T2-weighted and diffusion-weighted brain MRI showed a high-intensity area in the left parieto-occipital lobes (Figures 1G and H).
Electroencephalographic findings on hospital day 57.. Note: Positive sharp waves were evoked by photic stimulation in bilateral occipital leads as shown in the ovals.. Abbreviations: ECG, electrocardiogram; PS, photic stimulation; sec, second.
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Electroencephalogram showed positive sharp waves evoked by photic stimulation in bilateral occipital leads (Figure 2).