Fig. 4From: Inflammatory pseudotumor of Castleman disease and IgG4-related disease masquerading as kidney malignancyHistopathologic features of the masses in case 2. (A) Gross observation of resected masses. (B) Increased degree of fibrosis and dense infiltration of plasma cells and lymphocytes in the specimen (40×). (C) Plenty of lymphocytes and plasma cells infiltrate and form germinal centers (200×). (D) Storiform-type fibrosis and obliterative phlebitis (100×). (E,F) Immunohistochemistry revealed many IgG (E) and IgG4 (F) positive plasma cells (200×)Back to article page