Ninety-seven patients with FNEs in the Departments of Pediatrics, the Department of Hematology, and the Department of Respiratory Medicine at Kawasaki Medical School Hospital during June 2012 to April 2014 were enrolled in this study. Blood samples from 24 of the 97 patients showed positive results by blood culture and/or nucleic acid amplification tests. The characteristics and laboratory data of the 97 FNEs are listed in Table 1. The median age of patients was 32 years (range, 1–72). Among the 97 FNEs, 82 were admitted to the Department of Pediatrics, 11 to the Department of Hematology, and 4 to the Department of Respiratory Medicine. Ninety-three of the 97 FNEs (95.9%) had hematologic malignancies.