What is acute lymphoblastic leukemia (ALL)?

Updated: Feb 20, 2020
  • Author: Karen Seiter, MD; Chief Editor: Emmanuel C Besa, MD  more...
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Acute lymphoblastic leukemia (ALL) is a malignant (clonal) disease of the bone marrow in which early lymphoid precursors proliferate and replace the normal hematopoietic cells of the marrow. ALL is the most common type of cancer and leukemia in children in the United States. The image below shows B-cell lymphoblastic leukemia/lymphoma (B-ALL).

Acute lymphoblastic leukemia (ALL): Bone marrow sh Acute lymphoblastic leukemia (ALL): Bone marrow shows proliferation of large and heterogeneous lymphoblasts consistent with pre–B-cell ALL (French-American-British L2 morphology).

See the Childhood Acute Lymphoblastic Leukemia: Diagnosis, Management, and Complications slideshow to help recognize and treat this disease and its associated complications.

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