Report of three cases. Newly appeared immunosuppression related conditions have led to an increase in morbidity of systemic opportunistic mycoses. Rhinosinusal infection has also increased in frequency. Three invasive nasosinusal mycoses are presented: two cases of mucormycosis and a simultaneous infection by mucormycosis and candida albicans. In all cases, and despite treatment, progression of the disease could not be stopped and the patients died. The main characteristics of invasive nasosinusal mycoses are reviewed, to obtain early diagnosis. Early therapy improves the prognosis, and thus clinical suspicion justifies treatment before establishing a microbiological diagnosis.