Fever of undetermined origin and leukemia.
D006658:Histoplasma; D006801:Humans; D007951:Leukemia, Myeloid / Q000209:etiology / Q000473:pathology; D008198:Lymph Nodes / Q000473:pathology; D008297:Male; D008679:Metaplasia; D008875:Middle Aged; D055728:Primary Myelofibrosis / Q000473:pathology*; D013154:Spleen / Q000473:pathology