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Figure 2: (a) Dural biopsy showing extensive inflammation and (b) fibrosis with (c) dense plasma cell infiltrate. (d) The fibrosis highlighted by Masson's trichrome. (e and f) Intense positivity for immunoglobulin G4 in the plasma cells

Figure 2: (a) Dural biopsy showing extensive inflammation and (b) fibrosis with (c) dense plasma cell infiltrate. (d) The fibrosis highlighted by Masson's trichrome. (e and f) Intense positivity for immunoglobulin G4 in the plasma cells