Lymphoma is the most commonly diagnosed cancer in cats, accounting for about 33 percent of all feline tumors. Arising from lymphoid tissue, it can infect any organ, and cats of any age can be affected. A few studies have found that Siamese and male cats are at higher risk of developing lymphoma. The term lymphosarcoma is synonymous with lymphoma, but lymphoma is the preferred term.
Lymphoma commonly is divided into four groups: gastrointestinal (stomach, small intestine, large intestine), mediastinal (within the chest cavity), multicentric (the lymph nodes, liver and spleen) and extranodal (other organs, such as the eye, kidney, bone marrow, nervous system, skin, lungs and nasal cavity).
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