Predominantly leukaemic | | | | | | | | | | | |
Precursor T lymphoblastic leukaemia | + | + | +/− | +/− | − | − | − | − | − | − | Frequent presentation with mediastinal mass |
T cell PLL | − | + | +/− | −/+ | − | − | − | − | − | − | Multi-organ involvement including the skin |
T cell large granular lymphocytic leukaemia | − | + | −/+ | +/− | + | + | +/−* | − | − | − | Indolent behaviour |
Aggressive NK cell leukaemia | − | + | − | − | + | + | + | + | − | − | Multi-organ involvement, highly aggressive |
Adult T cell lymphoma/leukaemia (HTLV1+) | − | + | + | − | − | − | − | − | +/− | − | Usually widely disseminated, very rare in non-endemic areas |
Predominantly extranodal |
Extranodal NK/T cell lymphoma, nasal type | − | + | − | − | + | + | + | + | −/+ | − | Nearly always primary nasal localisation |
Enteropathy-type T cell lymphoma | − | + | − | −/+ | + | + | −/+ | −/+ | −/+ | − | Usually, but not always associated with coeliac disease |
Hepatosplenic γλ T cell lymphoma | − | + | − | − | − | + | + | − | − | − | Involvement of liver, spleen, and bone marrow |
Predominantly cutaneous |
Blastic NK cell lymphoma† | −/+ | − | + | − | −/+ | −/+ | + | − | − | − | Difficult distinction from T cell acute lymphoblastic leukaemia and myeloblastic leukaemia |
Subcutaneous panniculitis-like T cell | − | + | − | + | + | + | −/+ | − | − | − | Rimming of adipocytes |
Mycosis fungoides/Sezary syndrome | − | − | + | −/+ | −/+ | −/+ | − | − | − | − | Epidermotropism and Pautrier abscess formation |
ALCL primary cutaneous | − | −/+ | +/− | −/+ | +/− | +/− | − | − | + | − | Distinction with lymphomatoid papulosis only on basis of clinical behaviour |
Predominantly nodal |
ALCL systemic | − | −/+ | +/− | −/+ | +/− | +/− | − | − | + | +/− | ALK positive cases demonstrate favourable clinical outcome |
Peripheral T cell lymphoma, NOS | − | + | +/− | −/+ | − | − | − | − | +/− | − | Usually generalised disease |
Angio immunoblastic T cell lymphoma | − | + | + | + | − | − | − | + | − | − | Aggregates of CD21 positive dendritic cells, outside follicle centres. EBV positive B cells |