T-cell lymphoma is a type of cancer that affects the white blood cells called T-cells. It is characterized by the abnormal growth of T-cells in the body, which can lead to the formation of a tumor. Synonyms for this condition include peripheral T-cell lymphoma, angioimmunoblastic T-cell lymphoma, anaplastic large cell lymphoma, and cutaneous T-cell lymphoma. These conditions can cause various symptoms, such as fever, fatigue, night sweats, unexplained weight loss, and swollen lymph nodes. T-cell lymphoma is a rare type of cancer, accounting for approximately 15% of all cases of non-Hodgkin lymphoma. Treatment options depend on the severity and type of T-cell lymphoma and may include chemotherapy, radiation therapy, targeted therapy, and stem cell transplantation.