Fig. 2. Pathologic findings of the dura mater in the left frontotemporal area in patient 1. A: Dense lymphoplasmacytic infiltration with fibrotic tissue (hematoxylin & eosin staining, ×400; scale bar=50 µm). B: Focal IgG4-positive lymphocyte infiltration (IgG4 staining, ×200; scale bar=50 µm). C: Diffuse IgG-positive lymphocyte infiltration (IgG staining, ×200; scale bar=50 µm).
