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Pathological examination revealed areas of dense tumor cells with a high nucleocytoplasmic ratio and myxoid areas consisting of tumor cells with a round\u2010shaped nucleus and eosinophilic cytoplasm. Perivascular pseudorosette, necrosis, circumscribed growth, and microcalcification were also observed. Immunohistochemistry demonstrated negative staining for glial fibrillary protein and epithelial membrane antigen. Diagnosis of a high\u2010grade neuroepithelial tumor (HGNET) with <jats:italic>BCL6<\/jats:italic> corepressor (<jats:italic>BCOR<\/jats:italic>) alteration was made based on pathological findings and internal tandem duplication in the exon 15 of <jats:italic>BCOR<\/jats:italic>. 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