title: Hairy cell leukaemia with T-cell marker.
mesh_terms: D006801:Humans; D007943:Leukemia, Hairy Cell / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D012397:Rosette Formation; D013154:Spleen / Q000473:pathology / Q000648:ultrastructure; D013601:T-Lymphocytes / Q000276:immunology*