We present the results of a multicenter study of 445 patients with “proven” and “probable” invasive aspergillosis (EORTC/MSG, 2008). Invasive aspergillosis usually occurs in patients with hematological malignancies (88 %), main underlying diseases were acute myeloid and acute lymphoblastic leukemia. The risk factors: prolonged agranulocytosis (64 %), cytostatic chemotherapy (57 %), corticosteroid treatment (45 %), and allogeneic hematopoietic stem cells transplantation (29 %). The pathogens – A. fumigatus (42 %), A. niger (33 %), and A. flavus (21 %). The main site of infection were lungs (86 %). 12 week overall survival was 83 %. Bronchoscopy use for the early diagnosis (p = 0.01), adequate
therapy with voriconazole (p = 0.002) and secondary antifungal prophylaxis (p = 0.0003) were positive prognostic factors for survival of patients with invasive aspergillosis.