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Immunohistochemical findings for CD20 in the olfactory bulb (A) and brain stem (B‐E). Vessels occluded by malignant B cells are present in the left olfactory bulb (A), left cuneate nucleus (B), left solitary tract nucleus (C), right hypoglossal nucleus (D), and left dorsal accessory olivary nucleus (E). Scale bars, 800 μm (A), 50 μμm (a), 200 μm (B), 100 μm (C‐E).
