There are many types and variations of<unk> , each with vastly different symptoms, survival, and prognosis. The classification of<unk>  has been difficult to accomplish due to the lack of understanding of their biology. Most classifications are basic with many still under the title of ‘provisional categories’ in the World Health Organization Classification of disease. Common * Peripheral<unk> , not otherwise specified (PTCL-NOS): Most common type of Peripheral<unk>  (PTCL), comprising subtypes which cannot be classified as either nodal, extra-nodal, or leukemic * Angioimmunoblastic<unk>  (AITL): Aggressive form of<unk> . * Anaplastic large cell<unk>  (ALCL): ALCL has four distinct types: * ALK-positive anaplastic large cell<unk> : an aggressive, systemic ALCL that strongly expresses anaplastic<unk>  kinase, i.e. ALK. * ALK-negative anaplastic large cell<unk> : an aggressive, systemic ALCL that does not express ALK. * Primary cutaneous anaplastic large cell<unk> : a less aggressive ALCL that commonly presents as skin tumors. * Breast cancer-associated anaplastic large cell<unk> : a less aggressive ALCL that occurs around and is caused by breast implants. * Adult T-cell leukemia/lymphoma (ATL): Aggressive<unk> , associated with RNA retrovirus, human T-cell leukemia virus type-1 (HTLV1) * Extranodal NK/T-cell<unk> , nasal type (ENKTL): Aggressive<unk> , usually associated with Epstein Barr virus (EBV) * Cutaneous<unk>  (CTCL): can be indolent or aggressive * Mycosis fungoides * Sézary syndrome Rare * Subcutaneous panniculitis-like<unk>  (SPTCL): * Cutaneous gamma-delta<unk>  (CGD-TCL) * Systemic Epstein Barr virus-positive T-Cell Lymphoproliferative Disorders of Childhood (EBVTCLD): A very aggressive group with association with Epstein Barr virus (EBV) * Primary intestinal<unk> s * Enteropathy-associated<unk>  (EATL) * Monomorphic epitheliotropic intestinal<unk>  (MEITL). * Hepatosplenic<unk>  (HSTCL)
T-cell lymphoma
B-cell lymphoma
Aggressive lymphoma
Mixed-cell lymphoma
Large-cell lymphoma
Hodgkin lymphoma
Non-Hodgkin lymphoma
Thymic carcinoma