Feline lymphosarcoma is the most common neoplastic disease affecting cats. The clinical manifestation of the disease is extremely variable but it will generally appear in one or more of four pathological patterns: mediastinal, multicentric, abdominal, or leukemic form.

The abdominal form of lymphosarcoma may involve mesenteric lymph nodes, the terminal ileum, liver, spleen, or kidneys. Cats with the renal form of lymphosarcoma usually have severe involvement of both kidneys.12 Investigators at the Angell Memorial Animal Hospital in Boston corroborate the invariability of bilateral kidney involvement.

The following report presents a case of unilateral renal lymphosarcoma in a cat. The case was unique in that the disease was amenable to surgical Intervention.