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Fibrosing inflammatory pseudotumor is a non-specific inflammatory process of uncertain etiology. Histology of this lesion shows a polymorphous infiltrate with plasma cells, lymphocytes and eosinophils with a significant reactive fibrovascular component [Sung MV, Kim K, Lee C, Moh JH, Kim WH, Han MH. Fibrosing inflammatory pseudotumors of the central skull base. Laryngoscope 1997;107(12):1651–5; Helemberger...