Tumor venéreo transmissível canino com localização primária e única em cavidade oral

Abstract

The transmissible venereal tumor (TVT) can be observed in the oral cavity of dogs, without any association with genital lesions, and thus characterized as extragenital and primary. However, this form has a low prevalence. This present study aimed to describe an oral primary TVT in canine. One dog had a history of oral tumor. The animal was subjected to physical examination, when cytology of the oral neoformation was performed. It was chosen the administration of vincristine sulfate (0.75 mg/m2, every seven days, with a total of six sessions), and prednisolone (1 mg/kg every 24 hours, for seven days, followed by gradual reduction of the dose). It was detected a tumor in the rostral part of the jaw and another one in the right side of the mandible. Cytologic examination diagnosed TVT of mixed pattern. This tumor was not present in the external genitalia of the animal or in other anatomical locations. Thus, the TVT was characterized as an extragenital and primary form. After the sixth session of vincristine sulfate, and the completion of the administration of prednisolone, there was full remission of the tumors. The TVT must be included as a differential diagnosis of other oral neoformations in dogs, because, despite the possibility of macroscopic similarity, there is a distinction between them regarding prognosis and treatment.