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The initially resected cerebellar mass showed typical histologic findings of hemangioblastoma, which are characterized by stromal cells with plump foamy cytoplasms and abundant arborizing capillary networks (A). Immunohistochemically, the capillary endothelial cells were reactive for CD34 primary antibody (B1) and stromal tumor cells showed diffuse and strong cytoplasmic immunoreactivity for S100 protein (B2).
