Linfoma renal primário bilateral em cão - relato de caso

Abstract

Due to the increase in the life expectancy of pets, the incidence of diseases associated with senility, such as neoplasms, has been increasing. Among them, lymphoma stands out, representing about 20% of all canine tumors and 90% of hematopoietic neoplasms. Anatomically, lymphoma can present in multicentric form, more common in dogs, mediastinal or thymic, alimentary, cutaneous or extranodal. In extranodal form, a primary lymphoid tumor occurs in any location outside the lymphatic system. Renal lymphomas are common in the multicentric form of the disease, but reports of primary renal lymphoma in dogs are limited. The clinical signs in patients with renal lymphoma are nonspecific, and apathy, vomiting, polyuria, polydipsia and hyporexia may occur. Most patients have renomegaly, abdominal pain, hypertension and azotemia. Nephrectomy is recommended in cases of unilateral lymphoma associated with systemic chemotherapy. However, even with chemotherapy, primary renal lymphoma usually has an unfavorable prognosis. The objective of this work is to describe a case of a canine, eight years old, with ultrasound kidney changes compatible with the neoplastic process. The diagnosis of bilateral primary renal lymphoma was confirmed post-mortem based on the result of cytological evaluation and the absence of involvement of other anatomical sites.