Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Lymphocytic leukemia, acute (ALL)
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Lymphocytic leukemia, acute (ALL): A rapidly progressing form of leukemia in which there are too many very young (immature) white blood cells called lymphoblasts in the bloodstream and bone marrow.
ALL is spoken not as the word "all", but as the three letters: A.L.L. Acute lymphocytic leukemia is also called acute lymphoblastic leukemia.