The<unk> s <unk> s) consists of  a heterogeneous group of aggressive diseases that constitutes ~10%-15% of non Hodgkin lymphoma. The incidence has been estimated to be <1 case per 100,000 of ppl in United states.  The most common type is<unk> , not otherwise specified <unk> , NOS), followed by Anaplastic large cell lymphoma, primary systemic type (ALCL) , Angioimmunoblastic T cell lymphoma (AITL) and Extranodal NK/T cell lymphoma, nasal type <unk> s ), which is the rarest type. Although each type presents differently and has special histological features, they all have similar treatment . In addition, all the types have been associated with poor prognosis.  The most common presentation is generalized lymphadenopathy with or without extra nodal manifestations.
Peripheral T cell lymphoma
Nodal marginal zone lymphoma
Angioimmunoblastic T-cell lymphoma
Extranodal NK-T-cell lymphoma
B-cell lymphoma
T-cell lymphoma
Mantle cell lymphoma
Anaplastic large cell lymphoma