Um lobo guará fêmea (Chrysocyon brachyurus) apresentou nódulos nas mamas inguinal e abdominal cranial esquerda. As glândulas mamárias foram cirurgicamente excisadas, e na análise microscópica revelaram proliferação de células epiteliais em arranjo tubular e papilar com tecido conjuntivo de sustentação delicado e formação múltiplas camadas de células epiteliais moderadamente pleomórficas. Os achados histopatológicos foram compatíveis com carcinoma túbulo-papilar da glândula mamária. O estudo do perfil imuno-histoquímico mostrou positividade nuclear para estrógeno (70%) e progesterona (em pelo menos 90% das células). Observou-se perda da integridade da camada mioepitelial, adjacente a proliferação epitelial, evidenciada pela perda de reatividade para alfa actina de músculo liso em áreas de microinvasão. Índice de proliferação celular baixo foi observado (3,4%). O presente relato representa a primeira descrição de um carcinoma túbulo-papilar da glândula mamária em uma fêmea desta espécie.

A maned female wolf (Chrysocyon brachyurus) showed nodules in the inguinal and left abdominal cranial mammary glands. The mammary gland was surgically excised, and microscopic analysis revealed epithelial cell proliferation in a tubular and papillary pattern; delicate fibrovascular stalks presenting numerous layers of moderately pleomorfic epithelial cells were observed. This histologic appearance was compatible with a diagnosis of mammary tubulopapillary carcinoma. The immunohistochemical profile revealed nuclear positivity for estrogen (70%) and progesterone (at least 90% of the neoplastic cells). The myoepithelium-associated with neoplastic cells lacked integrity, as evidenced by failed smooth muscle alpha actin reactivity in microinvasive areas. A low proliferation index was observed (3.4%). To the authors' knowledge, the present case represents the first finding of female tubulopapillary carcinoma in a mammary gland in this species.

Serum hormone levels were compared between captive and free-living maned wolves and seasonal variations of sex hormones were studied. Blood samples were collected from 16 male and 26 female adult animals from Brazilian zoos, and from 30 male and 24 female free-living adults to determine serum progesterone and testosterone by radioimmunoassay. Serum testosterone concentrations varied (P < 0.05) across seasons for 16 captive males, being higher in autumn (2184.7 ± 355.1 pg/mL) than in summer (1080.7 ± 205.4 pg/mL), winter (1270.1 ± 276.6 pg/mL) and spring (963.9 ± 248.1 pg/mL), although they did not differ between summer, winter and spring. Testosterone concentration of 30 free-living males differed (P < 0.05) between autumn (824.1 ± 512.2 pg/mL), winter (14.4 ± 8.0 pg/mL) and spring (151.9 ± 90.5 pg/mL). Comparison between captive and free-living animals showed no difference in autumn (P > 0.05). Sixteen captive males showed higher testosterone concentration during winter and spring compared with 30 free-living animals (P < 0.05). Progesterone concentration varied among seasons in 26 captive females (P < 0.05), being higher in autumn (15.3 ± 3.1 ng/mL) than in summer (6.6 ± 1.5 ng/mL), winter (5.3 ± 3.1 ng/mL) and spring (4.3 ± 0.7 ng/mL). Progesterone concentration of 24 free-living females varied between autumn (17.1 ± 6.0 ng/mL) and winter (1.7 ± 0.3 ng/mL) (P < 0.05), but we could not obtain data for spring or summer. No difference in progesterone levels was observed between captive and free-living females in autumn and winter.

Realizou-se anastomose cólon-trígono vesical em 12 cães adultos (cinco machos e sete fêmeas), sem raça definida e clinicamente normais. Todos os animais mantiveram a continência urinária imediatamente após a cirurgia. Amostras da região de transição cólon-trígono vesical foram colhidas aos 30 e 60 dias após a cirurgia para exames histopatológicos. Observou-se infiltrado inflamatório mononuclear na região de anastomose com invasão do epitélio de transição da bexiga sobre a mucosa do fragmento intestinal. A técnica mostrou-se simples e eficiente para a reparação da bexiga, com o cólon funcionando como substituto da bexiga, preservando as funções renal e vesical.

Colonic-trigonal anastomosis was performed in 12 healthy adult mongrel dogs (five males and seven females). Samples of the colonic-trigonal anastomosis were collected for biopsy at 30 and 60 days after surgery. Histologic evaluation revealed a mononuclear inflammatory infiltrate in the area of anastomosis and also invasion of the transition epithelium onto the intestinal mucosa. These findings indicated that colonic-trigonal anastomosis is a simple and efficient procedure for primary bladder repair. Furthermore, the technique preserve the renal and vesical functions.