Fig. 4. Pathological findings of a 54-year-old female patient (Case 2). A: Low power (H&E, ×12) shows a portion of pituitary adenoma (left lower) and dura with inflammation (right upper). B: High power view (H&E, ×100) shows a classic histological findings of pituitary adenoma C: Dura with dense inflammation (H&E, ×40) is noted. D: High power view (H&E, ×200) shows dense inflammatory cell infiltrates with many plasma cells. E and F: The IgG4 positive plasma cells/IgG positive cells ratio was 24.8% based on IgG (E, ×200) and IgG4 (F, ×200) staining.
