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FIG 3. Histopathologic findings.
A, Photomicrograph of a routine paraffin section stained with hematoxylin-eosin (from a stereotactic brain biopsy) shows a hypercellular lesion populated by foamy histiocytes with uniform, benign nuclei (original magnification, x360).
B, Photomicrograph of the brain biopsy stained with immunocytochemical method for CD68 antigen shows granular cytoplasmic positivity (arrows) (original magnification, x360).
C, The stain for gliofibrillary acidic protein shows the histiocytes that are negative and a few reactive astrocytes and their processes that are darkly stained (arrows) (original magnification, x120).
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