case_images: PMC7160763_01
case_images: Electroencephalogram recorded during interseizure period on day 5. Sharp
  waves were recorded in the right frontal region (red box). These waveforms
  also showed disruption of background activity and subsequent emergence of
  slow waves. Low resolution and clipping traces are due to malfunction of the
  recording device.
case_images: 10.1177_2050313X20915416-fig1.jpg
case_images: PMC7160763_01_10.1177_2050313X20915416-fig1.jpg
case_images: fig1-2050313X20915416
case_images: EEG during FIAS showed rhythmic 5-9 Hz theta activity in the right frontotemporal region (data not shown). EEG recorded during an interseizure period revealed irregular right frontal sharp waves with theta and delta activities (Figure 1).
case_images: Coronal fluid attenuation inversion recovery magnetic resonance imaging of
  the brain on day 5. Bilateral atrophy of the hippocampus is observed (white
  arrows). No other clear abnormal findings, including ischemic
  leukoencephalopathy, were found. Diffusion-weighted imaging of the brain
  showed no significant abnormalities.
case_images: 10.1177_2050313X20915416-fig2.jpg
case_images: PMC7160763_01_10.1177_2050313X20915416-fig2.jpg
case_images: fig2-2050313X20915416
case_images: Magnetic resonance imaging (MRI) of the brain showed no obvious signs suggesting osmotic demyelination syndrome (ODS); however, marked atrophy of the hippocampus and temporal lobe was seen (Figure 2).