Mucormycosis is a fatal invasive infection which mostly involves diabetic or immunosuppressed patients. Early diagnosis, improving immunosuppression, systemic antifungal therapy, and surgical debridement are necessary for successful treatment. In this case study, we represent a known case of Wegener's granulomatosis (WG), with concomitant sinusal mucormycosis mimicking vasculitic disease relapse, which was successfully treated with surgical debridement, amphotericine, and intravenous immunoglobuline.