NCIt definition : A finding indicating the presence of a non-neoplastic or neoplastic proliferation
of lymphocytes in the peripheral blood, effusions, or bone marrow.;
Alternative definition : CTCAE: A finding based on laboratory test results that indicate an abnormal increase
in the number of lymphocytes in the blood, effusions or bone marrow.; NICHD: Abnormally high level of lymphocytes in the blood.;