A malignant lymphocytic neoplasm of B-cell or T-cell lineage involving primarily the bone marrow and the peripheral blood. This category includes precursor or acute lymphoblastic leukemias and chronic leukemias. The disease is Monarch Disease Ontology entry MONDO_0005402 (lymphoid leukemia). Also known as: leukemia, LYMPHOCYTIC, malignant, lymphocytic leukaemia, lymphocytic leukemia, lymphogenous leukaemia, lymphogenous leukemia, lymphoid leukaemia (disease), lymphoid leukemia (disease), subacute lymphoid leukaemia.