Primary ocular transmissible venereal tumor in a prepubescent female dog
Amaral, Andréia Vitor Couto doMucha, FrancineOliveira, Igor BorgesCarvalho, Camila Franco deAtaide, Wanessa FerreiraSaturnino, Klaus Casaro
Background: Canine transmissible venereal tumor (CTVT) is a peculiar neoplasm resulting from the transmission of hostcancerous cells to another canid by implantation. Transmission occurs among reproductive age dogs, especially thosewith unrestricted sexual activity. It usually occurs on the external genitalia of dogs and other areas are unusual. However,implants have been described in injured mucosa, as well as metastases in lymph nodes, spleen, skin, anus and perianalspace, oral mucosa, nasal mucosa, eyeball and brain. The purpose of this report is to describe the first case of exclusivelyextragenital ocular CTVT in a prepubescent female dog.Case: A 6-month-old mixed-breed, non-spayed and prepubescent female dog, showing a fast-growing reddish-coloredmass in the right eye (RE), was examined. Blepharospasm, mild serosanguineous secretion, chemosis and a smooth surfacereddish mass with 2.5 cm in length occupying the orbital area were observed during physical examination, impairing thevisualization of the right eyeball. For ocular ultrasonography examination of the affected eye, acepromazine was used (0.03mg/kg) associated with methadone (0.3 mg/kg) intramuscularly, and propofol (4 mg/kg) for induction and 0.2 mg/kg formaintenance, intravenously. Ultrasonography examination evidenced an amorphous hyperechogenic structure, medial tothe RE, with homogeneous echotexture, punctiform vascularization to amplitude Doppler (Power Doppler), measuring 2.8cm in length and 1.4 cm in diameter, causing eyeball distortion and rejection. Based on ultrasonography results and withthe patient still anesthetized, an incisional biopsy of the peribulbar mass was performed with a 5 mm disposable punch.The final CTVT diagnosis was possible after histopathological analysis. No more CTVT nodules were found, especiallyin the vulva, which had a prepubescent appearance, consistent with age. Treatment...(AU)
Texto completo