What is the definition or description of: acute lymphoblastic leukemia?

The acute: Leukemias are those that are immediately life threatening if left untreated. The most common in children is the lymphoid t ype, ie arising from lymphocytes. In adults the myeloid type is more common.

See below: Acute lymphoblastic leukemia (all) is a type of cancer of the blood. The cancerous cell in all is the lymphoblast. There are differ ENT types of lymphoblasts, which lead to different types of all (b cells, t cells, pre-b cells). This leukemia is called acute because it develops fairly rapidly (over several weeks).

ALL: ALL is a type of leukemia that starts from white blood cells in the bone marrow, the soft inner part of bones. It develops from cells called lymphocytes, a type of white blood cell central to the immune system, or from lymphoblasts, an immature type of lymphocyte. ALL invades the blood and can spread throughout the body to other organs, such as the liver, spleen, and lymph nodes