from Section IV - Neoplastic Disorders of Bone Marrow
Published online by Cambridge University Press: 25 January 2024
Lymphoblastic leukemias/lymphomas constitute a family of malignant lymphoid neoplasms that morphologically and immunophenotypically recapitulate the features of early lymphoid precursors of either B- or T-cell origin [1–4]. The distinction between acute lymphoblastic leukemia (ALL) and lymphoblastic lymphoma (LBL) is arbitrary [4]. The term LBL is used when the disease is confined to a predominant extramedullary mass lesion with no or minimal involvement (<25%) of peripheral blood and bone marrow (BM). The cases with ≥25% blasts in either peripheral blood or BM are staged and treated as ALL [1,4].
ALL and LBL have many characteristics in common. They are morphologically indistinguishable, share similar immunophenotypes, and have overlapping cytogenetic profiles. It is generally believed that the two entities are biologically equivalent, represent a clinical continuum or different stages of the same disease, and are categorized as such by the 2017 World Health Organization (WHO) classification scheme [2–5].
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