Precursor T-cell lymphoblastic leukemia

Precursor T-cell lymphoblastic leukemia is a form of lymphoid leukemia, in which too many T-cell lymphoblasts (immature white blood cells) are found in the blood and bone marrow. It is sometimes additionally classified as a lymphoma, as designated Precursor T-cell lymphoblastic lymphoma.

It comprises 85% to 90% of lymphoblastic lymphoma.