Peripheral T-cell non-Hodgkin's lymphoma.

T-cell non-Hodgkin's lymphoma (T-NHL) are uncommon malignancies accounting for 10% to 15% of all NHL. Geographic variation has been well documented, but the geographic variation may reflect exposure to specific pathogenic viruses, such as Epstein Barr Virus and Human T-cell leukemia virus-1 in Asian countries. The World Health Organization classification specifies 16 major subtypes of T-NHL. Each of the major subtype of peripheral T-NHL has unique characteristics and are addressed separately in this article.