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a MRI (sagittal T1-weighted image with gadolinium) showing a contrast-enhanced solid cerebellar lesion. b MRI (axial T1-weighted image with gadolinium) showing leptomeningeal dissemination in cerebellum and left cerebellopontine angle (arrows). c Medulloblastoma of the histological defined classic form: poorly differentiated round and polyhedric embryonal cells with high mitotic activity (arrows) (H&E ×40). d Immunoreactivity for neurofilament antibody (×40).
