Principal characteristics of clinical and paraclinical pictures of nasosinusal aspergillosis (NSA) in 35 patients are analyzed and allow distinction of three main types of this nasosinusal fungal lesion. Localized, non-invasive nasosinusal aspergillosis (NINSA) is frequently of dental origin and presents as a chronic maxillary sinusitis resistant to conventional treatment. Serology is negative or non-significant for Aspergillus and recovery is complete after surgery. Invasive nasosinusal aspergillosis (INSA) affects debilitated patients (diabetes, immunodepression, malignant blood disease...), and presents with bone destruction, extension to orbit, base of skull and intracranial region, following an acute or subacute course with positive serology for Aspergillus. Early, wide surgical eradication is combined with local and general antifungal therapy but prognosis is poor. Allergic nasosinusal aspergillosis (ANSA), of more recent description, combines chronic sinusitis with severe nasosinusal polyposis, and specific histologic and immunologic features. Its course is favorable with corticoid therapy but long-term results are unknown.