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  2. Lymphocytosis - Wikipedia

    en.wikipedia.org/wiki/Lymphocytosis

    In adults, absolute lymphocytosis is present when the lymphocyte count is greater than 5000 per microliter (5.0 x 10 9 /L), in older children greater than 7000 per microliter and in infants greater than 9000 per microliter. [1] Lymphocytes normally represent 20% to 40% of circulating white blood cells. When the percentage of lymphocytes exceeds ...

  3. Chronic lymphocytic leukemia - Wikipedia

    en.wikipedia.org/wiki/Chronic_lymphocytic_leukemia

    Diagnosis is typically based on blood tests finding high numbers of mature lymphocytes and smudge cells. [5] This is an example of how a smudge cell looks on a peripheral blood smear, which is a common finding in patients with chronic lymphocytic leukemia (CLL).

  4. T-cell prolymphocytic leukemia - Wikipedia

    en.wikipedia.org/wiki/T-cell_prolymphocytic_leukemia

    T-cell-prolymphocytic leukemia (T-PLL) is a mature T-cell leukemia with aggressive behavior and predilection for blood, bone marrow, lymph nodes, liver, spleen, and skin involvement. [1] T-PLL is a very rare leukemia, primarily affecting adults over the age of 30. It represents 2% of all small lymphocytic leukemias in adults. [2]

  5. White blood cell differential - Wikipedia

    en.wikipedia.org/wiki/White_blood_cell_differential

    A white blood cell differential is a medical laboratory test that provides information about the types and amounts of white blood cells in a person's blood. The test, which is usually ordered as part of a complete blood count (CBC), measures the amounts of the five normal white blood cell types – neutrophils, lymphocytes, monocytes, eosinophils and basophils – as well as abnormal cell ...

  6. Large granular lymphocytic leukemia - Wikipedia

    en.wikipedia.org/wiki/Large_granular_lymphocytic...

    Large granular lymphocytic (LGL) leukemia is a chronic lymphoproliferative disorder that exhibits an unexplained, chronic (> 6 months) elevation in large granular lymphocytes (LGLs) in the peripheral blood. [1] It is divided in two main categories: T-cell LGL leukemia (T-LGLL) and natural-killer (NK)-cell LGL leukemia (NK-LGLL).

  7. Leukemia - Wikipedia

    en.wikipedia.org/wiki/Leukemia

    Some people diagnosed with leukemia do not have high white blood cell counts visible during a regular blood count. This less-common condition is called aleukemia. The bone marrow still contains cancerous white blood cells that disrupt the normal production of blood cells, but they remain in the marrow instead of entering the bloodstream, where ...

  8. Acute lymphoblastic leukemia - Wikipedia

    en.wikipedia.org/wiki/Acute_lymphoblastic_leukemia

    In acute lymphoblastic leukemia, lymphoid cell development stops at the lymphoblast (arrow), which are also overproduced. The cancerous cell in ALL is the lymphoblast. Normal lymphoblasts develop into mature, infection-fighting B-cells or T-cells, also called lymphocytes. Signals in the body control the number of lymphocytes so neither too few ...

  9. Hairy cell leukemia - Wikipedia

    en.wikipedia.org/wiki/Hairy_cell_leukemia

    Hairy cell leukemia is an uncommon hematological malignancy characterized by an accumulation of abnormal B lymphocytes. [1] The incidence of hairy cell leukemia (HCL) is 0.28-0.30 cases per 100,000 people in Europe and the United States and the prevalence is 3 cases per 100,000 in Europe with a lower prevalence in Asia, Africa and the Middle East.