Learn about the three most important lines of latitude on Earth - the equator, Tropic of Cancer, and Tropic of Capricorn. Learn about the three most important lines of latitude on Earth - the equator, Tropic of Cancer, and Tropic of Capricorn.
General Discussion. Hairy cell leukemia (HCL) is a rare type of blood cancer characterized by abnormal changes in white blood cells known as B lymphocytes. The bone marrow creates too many of these defective cells, known as hairy cells because of the thin hair-like projections found on their surface.
Final Diagnosis -- Hairy cell leukemia. By WHO definition, hairy cell leukemia (HCL) is an indolent lymphoid neoplasm of small mature B lymphoid cells with oval nuclei and abundant cytoplasm with hairy projections involving peripheral blood (PB) and which diffusely infiltrates the bone marrow and splenic red pulp.