Tumefactions as an extravascular manifestation of Wegener's granulomatosis.

Wegener's granulomatosis appeared as localized or infiltrative tumefactions in six patients. The tissue swellings affected the retroperitoneum, mediastinum (two), breast, retroorbital tissue (two), and gingiva. There was extensive fibroblastic proliferation in each case with a predominantly granulocytic inflammatory component, microabscess formation, and collagen necrobiosis. In one of the mediastinal lesions and in the gingiva, there was a granulomatous component as well. In the breast were scattered multinucleated histiocytes. Necrotizing vasculitis was absent or limited in all cases. All patients responded dramatically to cyclophosphamide and/or prednisone after the diagnosis was established. These observations indicate a role for tissue destruction in Wegener's granulomatosis mediated by granulocytes without a vasculitic component.