In contrast with B-cell lymphoma, the classification of such a rare neoplasm has been controversial, since the cytologic features have not been very useful. Further, by many entities, T-cell and natural killer cell <unk>  neoplasms do not share any similar immuno-phenotype. Because of such matters, clinical features became handier for classification and somehow even more important than the precise cell of origin. since the majority of cytotoxic T-cell and<unk>  cell lymphomas are located out of lymph nodes, the gene expressing cytotoxic molecules may predispose to apoptosis by tumor cells and by standard cells.Three major categories of<unk>  T/NK cell tumors include:<unk> <unk> /T-cell lymphoma, nasal type lymphoma,<unk> <unk> /T-cell lymphoma, enteropathy type lymphoma,<unk> <unk> /T-cell lymphoma, subcutaneous panniculitis-like,<unk> <unk> -T-cell lymphoma may be classified according to WHO into 2 subtypes:,<unk>  cell-derived neoplasms, namely, aggressive<unk>  cell leukemia,<unk> <unk> /T-cell lymphoma, nasal type, Based on the organ involvement,<unk> <unk> -T-cell lymphoma may be classified into:<unk> <unk> -T-cell lymphoma, nasal type,<unk> <unk> -T-cell lymphoma, extra nasal type
Extranodal NK-T-cell lymphoma classification
Mantle cell lymphoma classification
Anaplastic large cell lymphoma classification
B-cell lymphoma classification
Follicular lymphoma classification
Diffuse large B cell lymphoma classification
Burkitt's lymphoma classification
Langerhans cell histiocytosis classification