T Lymphoblastic Leukemia/Lymphoma

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm of lymphoblasts committed to the T-cell lineage, typically composed of small to medium-sized blast cells. When the neoplasm involves predominantly the bone marrow and the peripheral blood, it is called T acute lymphoblastic leukemia. When it involves nodal or extranodal sites it is called T lymphoblastic lymphoma. (WHO, 2001)

**Synonyms:** - Precursor T Lymphoblastic Leukemia/Lymphoma - Precursor T Lymphoblastic Lymphoma/Leukemia - Precursor T-Lymphoblastic Lymphoma/Leukemia - T lymphoblastic leukemia/lymphoma - T-Cell Lymphoblastic Leukemia/Lymphoma - T-Lymphoblastic Leukemia/Lymphoma - T-Lymphoblastic Leukemia/Lymphoma