Lymphosarcoma, also known as lymphoma, is a type of cancer that originates in the lymphatic system, which is part of the body's immune system. It occurs when lymphocytes, a type of white blood cell, grow uncontrollably. This can lead to the formation of tumors in lymph nodes and other organs, affecting the body's ability to fight infections. There are various forms of lymphosarcoma, including Hodgkin lymphoma and non-Hodgkin lymphoma. Symptoms may include swollen lymph nodes, fever, weight loss, and fatigue. Diagnosis typically involves imaging tests and a biopsy, while treatment options may include chemotherapy, radiation therapy, or targeted therapies.