This study is a multi-center, open-label, prospective and observational study enrolling approximately 440 patients. The primary objective of this study is to examine the fever response rate after itraconazole IV (directly into the vein) is administered for more than 3 days to patients with neutropenic fever based on investigator's discretion. Follow-up will be performed before and after administration and for 7 days after administration. Study population consists of the patients who visit a study center during the study period and are judged to have neutropenic fever associated with hematologic malignancy such as acute leukemia, hodgkin's lymphoma, non-hodgkin's lymphoma, myelodysplastic syndrome, and multiple myeloma. The decision to treat patients with itraconazole is as per physician discretion and doses are determined based upon approved labeling recommendations and physician discretion. The safety and efficacy of itraconazole administered beyond 29 days is not yet been established in the treatment of fever in neutropenic patients suspected of systemic fungal infection. Itraconazole 200 mg IV twice daily for 2 days, for a total of 4 doses, then 200 mg IV once daily for 12 days. After the administration for a total of 14 days, itraconazole oral solution 200 mg (20 ml) twice daily should be continued for a total of 14 days