Mycosis Fungoides and Sezary Syndrome B0 TNM Finding v8

**Semantic type:** Finding

**Definition:** Absence of significant blood involvement: 5% or less of peripheral blood lymphocytes are atypical (Sezary cells). Note: for blood, Sezary cells are defined as lymphocytes with hyperconvoluted cerebriform nuclei. If Sezary cells cannot be used to determine tumor burden for B2, then one of the following modified ISCL criteria along with a positive clonal rearrangement of the TCR may be used instead: (1) expanded CD4+ or CD3+ cells with CD4/CD8 ratio of 10 or more, (2) expanded CD4+ cells with abnormal immunophenotype including loss of CD7 or CD26. (from AJCC 8th Ed.)