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Abstract A 4-year-old female captive-bred snake of the genus Bothrops showed swelling on the left side of the oral cavity, suggesting the development of neoplasia. The mass was removed surgically and sent for pathological examination. Two months later a new increase in volume in the same site was observed, suggesting recurrence. The lesion was completely removed and sent for pathological analysis. Histologically, the two-samples consisted of a mass with highly-cell density composed of spindle-shaped anaplastic cells arranged in interwoven bundles, distributed throughout the tissue extension and, occasionally, polygonal cells arranged in irregular fascicles. The Masson trichrome staining showed modest amount of collagen supporting the neoplastic cells. PAS-positive content was not observed in the cytoplasm of neoplastic cells. Histological and histochemical findings indicated that it was a spindle cell neoplasm, but the classification was not possible. Immunohistochemistry was requested and performed using the streptavidin-biotin-peroxidase method. The markers used were anti-vimentin, anti-PCNA, anti-EMA, anti-melan A and anti-melanosome, anti-desmin, anti-actin, anti-CD68 and anti- S100protein. The neoplastic cells were immunoreactive for vimentin and PCNA and negative for the other antibodies. The morphology characterization, histochemical and immunohistochemical analysis of neoplastic cells allowed the definitive diagnosis of oral fibrosarcoma.

O gato-do-mato-pequeno (Leopardus tigrinus) apresenta porte e proporção corporal semelhante ao gato doméstico e é a menor espécie de felídeo não doméstico do Brasil, sendo classificado com espécie da fauna brasileira ameaçada de extinção. Em gatos domésticos, o fêmur é o osso que mais sofre trauma e a porção distal é a mais acometida por fraturas. Uma fêmea de gato-do-mato-pequeno, com cinco meses de idade, apresentando fratura completa transversa supracondilar de fêmur direito foi tratada com sucesso por meio de osteossíntese com dois fios de Kirschner cruzados. Aos 60 dias de evolução do procedimento cirúrgico, a paciente recebeu alta do Hospital Veterinário, sendo devolvida ao seu local de origem. Segundo o conhecimento dos autores, este é o primeiro relato de osteossíntese de fêmur com o uso de fios de Kirschner em Leopardus tigrinus. Assim, o tratamento foi desenvolvido com base em dados referentes ao gato doméstico em função da similaridade anatômica entre as duas espécies. O método de osteossíntese escolhido, nesse relato, mostrou-se eficaz, promovendo retorno adequado à função do membro.The little spotted cat or oncilla (Leopardus tigrinus) is a wild feline that has size and body proportions similar to the domestic cat (Felis catus), but can be classified as the smallest wild feline all the way from Costa Rica to Brazil and Argentina threatened with extinction. In domestic cats, the distal portion of the long bone femur is more susceptible to fractures. The aim of this paper is to report the treatment of a complete, transverse, supracondylar fracture of the right femur on a five-month-old little female oncilla, by internal fixation by two crossed Kirschner wires. At 60 days after surgery, the patient was discharged from the veterinary hospital and returned to its place of origin. Considering the author's knowledge, this is the first report of osteosynthesis in L. tigrinus using this described technique. Due to similarities with species, anatomical, surgical and anesthetics data of domestic cats were considered. The fixation method was successful and limb function was achieved without any complication.