[Differential diagnostic aspects of lethal midline granulomas (granuloma gangraenescens].

The lethal midline granuloma and limited Wegener's granulomatosis show clinical similarity, although they are of different etiology. The following case of a 53-year-old woman shows how difficult it is to establish the precise diagnosis of lethal midline granuloma. The diagnosis depends on the pathological finding of a lymphoma. The lymphoma can be differentiated in a T- or a B-cell lymphoma by immunostaining. However, the diagnostic yield of biopsies from the nose is not perfect. It would be, therefore, important to find other diagnostic criteria. The presence of the c-ANCA is a helpful tool, but in the case of limited Wegener's granulomatosis, it has a sensitivity of 50%. The prognosis of the lethal midline granuloma is poor even if an adequate radiation therapy is instituted.