Sinonasal mycosis is increasingly reported in the literature. Four clinicopathologic forms have been recognized: the fulminate invasive form, the chronic indolent sinusitis, the fungus ball, and the newly described allergic fungal sinusitis (AFS). This work presents 16 instances, in 14 patients, with fungal sinusitis. The presence of unilateral nasal polyps was particularly suspicious and CT scan picture was characteristic. All patients were treated surgically with adjuvant chemotherapy. Long-term postoperative follow-up with CT scan is highly recommended.