T-ALL

Also known as T-Lymphoblastic leukemia/lymphoma (or T-Acute lymphoblastic leukemia) is an Acute leukemia of lymphoid origin (specifically T-cell origin). Many involve the anterior mediastinum (thymus). Recall the mnemonic of 4 "Ts" for Anterior Mediastinal Lesions: T for Terrible lymphomas (e.g. T-ALL, although Hodgkin lymphoma many times may involve anterior mediastinum and is not as aggressive as T-ALL), T for Thymoma, T for Thyroid remnant, and T for Teratoma (or other germ cell neoplasms).