Definition of hairy cell leukemia - NCI Dictionary of Cancer Terms

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hairy cell leukemia (HAYR-ee SEL loo-KEE-mee-uh)

A rare type of leukemia in which abnormal B-lymphocytes (a type of white blood cell) are present in the bone marrow, spleen, and peripheral blood. When viewed under a microscope, these cells appear to be covered with tiny hair-like projections.

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