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T1-weighted, gadolinium-enhanced sagittal magnetic resonance image (left) and axial MRI (right), showing a well-demarcated intensely enhancing lesion occupied almost the entire fourth ventricle.
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Magnetic resonance imaging (MRI) of his brain showed a homogeneously enhancing, well defined mass lesion occupying almost the entire fourth ventricle (Fig. 1).
The Hematoxylin-eosin stain revealed diffuse infiltration of atypical lymphocytes with irregular nuclei (a). Immunohistochemistry stains show the cells positive for CD20 (b) and CD10 (c).
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The morphology and immunohistochemistry profile were consistent with a diffuse large B-cell lymphoma (Fig. 2).