A neoplasm of small B-lymphocytes with "hairy" projections in bone marrow, spleen, and peripheral blood. Most patients present with splenomegaly and pancytopenia. (WHO, 2001)

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.

Neoplastic disease of the lymphoreticular cells which is considered to be a rare type of chronic leukemia; it is characterized by an insidious onset, splenomegaly, anemia, granulocytopenia, thrombocytopenia, little or no lymphadenopathy, and the presence of hairy or flagellated cells in the blood and bone marrow.

(leukemia, hairy cell) A neoplastic disease of the lymphoreticular cells which is considered to be a rare type of chronic leukemia; it is characterized by an insidious onset, splenomegaly, anemia, granulocytopenia, thrombocytopenia, little or no lymphadenopathy, and the presence of "hairy" or "flagellated" cells in the blood and bone marrow.

(classic hairy cell leukemia) A rare, slowly progressive, chronic leukemia characterized by presence of abnormal B-lymphocytes (medium sized with abundant irregular pale cytoplasm, hair-like cytoplasmic projections/ruffled cytoplasmic border, a round or bean-shaped nucleus and absent nucleoli) in the blood or bone marrow, spleen and peripheral blood pancytopenia, notable monocytopenia, and marked susceptibility to infection. The characteristic immunophenotype is CD11c+, CD25+, CD103+ and CD123+ with a BRAF mutation in most cases.

Hairy cell leukemia (HCL) is a chronic lymphoid leukemia, originally described in 1958 by Bouroncle and colleagues and named after the hairlike cytoplasmic projections seen on the surface of the abnormal B-cells (see the image below).See Chronic Leukemias: 4 Cancers to Differentiate, a Critical Images slideshow, to help detect chro...

Hairy cell leukemia is a rare, slow-growing cancer of the blood in which your bone marrow makes too many B cells (lymphocytes), a type of white blood cell that fights infection.

Hairy cell leukemia is a rare, slow-growing cancer of the blood in which the bone marrow makes too many B cells (lymphocytes), a type of white blood cell that fights infection. The condition is named after these excess B cells which look 'hairy' under a microscope. As the number of leukemia cells increases, fewer healthy white blood...

Hairy cell leukemia (HCL) is an uncommon mature B-cell neoplasm. It was described as a distinct clinical entity in 1958. Seen under the microscope, the cells have delicate cytoplasmic projections, resembling hair, and that is why the disease was named HCL. The disease has a characteristic presentation of pancytopenia, splenomegaly, and...