Mycotic sinusitis is not a rare disease of paranasal sinuses. Today, with improved diagnostic techniques, mycoses are more readily recognized, and factors that predispose to fungus infections are apparently increasingly common. Fungal diseases are becoming not only better understood, but also increasingly important in the management of patients with paranasal sinus disease. Fourty-seven cases of mycotic sinusitis during a period of 12 years from January 1980 through February 1992 were analysed.