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[Cytotoxic lesion of the corpus callosum (CLOCC) in a context of viral meningitis].

We report the case of a young patient of 16 years admitted in the emergency department for headache, nausea and vomiting, of brutal installation. After clinico-biological confrontation, the diagnosis of viral meningitis (aseptic) was made. During the initial assessment several complementary examinations and various brain imaging exams (CT, MRI) were performed in the course of the treatment, showing a focal lesion of the splenium of the corpus callosum, with transient aspect and spontaneously resolving during iterative control. MRI is the modality that formally revealed this callosal lesion. In terms of signaling behavior, this lesion is characterized by an hyperintensity on FLAIR/T2 weighted sequence and a restriction of diffusion (cytotoxic edema). No other signaling abnormalities or malformative lesions are found. The iconographic diagnosis of «cytotoxic lesions of the corpus callosum» (CLOCC for «Cytotoxic lesion of the corpus callosum») was made.