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Inflammatory fibrosarcoma is an uncomon disease that results from accumulation of inflammatory cels and relatively high recurrences rate in childhood. It has been reported that it most often occurs in lungs and sometimes in gastrointestinal tract, diagnosis is dificult. Most cases are therefore diagnosed at the late stage. Invasion of inflamatory fibrosarcoma to orbital wall, cribriform plate and skull base is also comon. We present a 75-year-old woman with inflammatory fibrosarcoma, which occured in the right maxillary sinus and nasal cavity. (Korean J Otolaryngol 2002;45:918-20)