PMC9108491_01
(A) Electroencephalogram (EEG) done on day 6 following the CO poisoning and a day after the onset of seizures. The EEG demonstrates severe encephalopathy with no focal findings. (B) EEG done on day 10 following the CO poisoning and 4 days after the onset of seizures. EEG demonstrates improvement background activity of Theta waves with several Delta waves.
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F1
Non-contrast and contrast enhanced, including the venous phase, computed tomography (CT) was within normal limits; electroencephalogram (EEG) demonstrated diffuse slow delta waves, consistent with encephalopathy without focal findings or epileptiform activity (Figure 1A). Repeated EEG demonstrated improvement of background activity (Figure 1B), consistent with the clinical improvement, and the child was discharged from the hospital.
MRI done on day 9 following the CO poisoning and 3 days after the onset of seizures. The MRI of the basal ganglia in a single coronal localizer image and multiple axial images including T1 pre- and post-contrast, diffusion, FLAIR, T2 at the level of the basal ganglia show normal signal within the basal ganglia and deep nuclei.
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F2
Brain magnetic resonance imaging (MRI) demonstrated no pathological findings (Figure 2).