[Midline granuloma].

Midline malignant granuloma is the term used for a histogenetically heterogeneous group of diseases characterized by progressing destruction of tissues of the sinonasal area. The difficulty of differentiation of basic clinical pathological units included in this group, which is of fundamental importance for the subsequent therapeutic procedure, is demonstrated on two cases of Wegener's granulomatosis and sinonasal pleomorphous reticulosis.