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Histologic features of middle cranial fossa biopsy from patient one. Hematoxylin and eosin stain at low (10X) (left) and high (middle) (40X) power depict abundant macrophages, lymphocytes and plasma cells. Immunohistochemical stain for IgG4 (right) demonstrates multiple immunoreactive plasma cells. (scale bars: left 200 µm, middle, right 50 µm).
