Transmissible cutaneous venereal tumor without genital involvement in a male dog

Abstract

The transmissible venereal tumor (TVT) is a round cells tumor, transmitted from the highly contagious neoplastic cell transplantation, which mainly affects the external genitalia of dogsand also extragenital regions. The cutaneous form usually affects the region of the face and limbs, secondary to a primary genital focus simultaneously. A case of cutaneous TVT without genital involvement is reported in a four-year-old male,without racial standard set, half-domiciled, with a major complaint of a nodular, friable and ulcerated lesion with bloody exudation in the lateral cervical region. Fine needle aspirationwas performed for cytological evaluation, and presented a monomorphic round cell population, with cytoplasmic vacuolization, basophilic and scarce cytoplasm, oval and centralized nuclei. The cytology evaluation was compatible with TVT. The chemotherapy protocol was adopted with vincristine sulphate at 0.025 mg/kg every 7 days. Complete regression of the tumor mass was observed after six weeks. Involvement of the cutaneous tissue without venereal involvement is uncommon, and thereafter the TVT is included as a differential diagnosis of isolated nodular cutaneouslesions.