Lymphoid leukemia overview

Overview
Lymphoid leukemia (or lymphocytic leukemia) is a type of leukemia affecting lymphoid tissue.

They are most commonly divided by their onset:
 * Acute lymphoblastic leukemia
 * Chronic lymphocytic leukemia

However, they are sometimes divided by the cells affected:
 * T-cell leukemia
 * B-cell leukemia