EN
This is a case study of the neoplasm which was detected in the kidney of a 6-year-old dog. Clinical examination, radiography and ultrasonography were used to define the extent and location of the mass. The removed tumor was 16 cm in diameter and weighed 2560 g. Histological and immunohistochemical diagnosis revealed a mixed character of the tumor, resembling fibrosarcoma and leiomyosarcoma.