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Figure 2: Histopathology (a) showing a marked lymphocytic infiltrate in the white matter with perivascular predominance (hematoxylin and eosin 40×). Immunohistochemistry showing the lymphocytic infiltrate was composed predominantly of T lymphocytes that were CD3 reactive (b) and few CD20-positive B lymphocytes (c). A few CD68-positive histiocytes were also seen (d)

Figure 2: Histopathology (a) showing a marked lymphocytic infiltrate in the white matter with perivascular predominance (hematoxylin and eosin 40×). Immunohistochemistry showing the lymphocytic infiltrate was composed predominantly of T lymphocytes that were CD3 reactive (b) and few CD20-positive B lymphocytes (c). A few CD68-positive histiocytes were also seen (d)