Figure 3
From: IgG4-related intracranial hypertrophic pachymeningitis with skull hyperostosis: a case report
Histopathological findings. A-D. Sections of the dura and galea show increasing inflammatory change (A, H&E, ×40) composed of mainly lymphoplasma cells in a storiform fibrous background with occasional eosinophils (B, H&E, ×100; C, H&E, ×200). Lymphoid follicles with germinal center formation are also seen in a section of galeal tissues (D, H&E, ×100). E&F. IgG4 (+) plasma cells account for more than 50% of IgG (+) cells with a mean more than 30 in 3 higher power fields (ABC immunohistochemical stain, E, ×100; F, ×200).