Source:http://linkedlifedata.com/resource/umls/id/C0023452
MSH: When the disease process is confined to a mass lesion with no or minimal evidence of blood and less than 25% marrow involvement, the diagnosis is lymphoblastic lymphoma; with blood and greater than 25% marrow involvement, ALL is the appropriate term.,NCI: An acute lymphoblastic leukemia occurring during childhood. The majority of cases are B-acute lymphoblastic leukemias. Approximately 15% of the cases are T-acute lymphoblastic leukemias.