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  • Title: Thyroid crisis mimicking clinically mild encephalitis/encephalopathy with a reversible splenial lesion: A pediatric case report.
    Author: Matsubara K, Kuki I, Yamamoto N, Nagase S, Inoue T, Nukui M, Okazaki S, Yamada Y, Kawawaki H.
    Journal: Brain Dev; 2021 Apr; 43(4):596-600. PubMed ID: 33408037.
    Abstract:
    BACKGROUND: Reversible lesions in the splenium of the corpus callosum (SCC) with viral infections are associated mainly with clinically mild encephalitis/encephalopathy with a reversible splenial lesion (MERS). We report a pediatric patient in thyroid crisis with reversible SCC lesions. CASE DESCRIPTION: We diagnosed a 9-year-old girl with thyroid crisis. She had presented with fever, tachycardia, and impaired consciousness. Magnetic resonance imaging revealed hyperintense signals in the splenium and genu of the corpus callosum and a white matter lesion of the left hemisphere in diffusion-weighted imaging. The initial, tentative diagnosis was clinically mild encephalitis/encephalopathy with a reversible splenial lesion (MERS). We initiated intravenous methylprednisolone pulse therapy; thereafter, her level of consciousness rapidly improved. On admission, thyroid function studies revealed elevation of free thyroxine and a low level of thyroid stimulating hormone with thyroid-related autoantibodies. She was begun on thiamazole and was discharged without neurological sequelae. CONCLUSION: Thyroid crisis is similar to acute encephalitis or encephalopathy associated with viral infection, especially with MERS, because the clinical and radiological features resemble those of thyroid crisis; therefore, thyroid diseases should be considered as a possible cause of reversible lesions in the splenium of the corpus callosum.
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