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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 6B1 IgG4 Disease Adenohypophysis (Case 6) A2 H&E 4X
6B1-7 The histopathology of the tumor is characterized by multifocal infiltration by large numbers of bland appearing plasma cells, which are present within the stroma and focally invade the acini. Sclerosing fibrosis and/or phlebitis are not evident.