Enzootic bovine leucosis ­ a case report / Leucose enzoótica bovina ­ relato de caso

Enzootic bovine leucosis is an infectious disease of cattle caused by the bovine leukemia virus that results in lymphoma within target tissues. Cattle might demonstrate four clinicopathological age-related manifestations of the disease: juvenile, adult, thymic, and cutaneous form. This article describes the unusual manifestation of this disease in a 4-yr-old cow. Regional lymph nodes were enlarged during clinical examination. Peripheral and internal lymph nodes, as well as the vagina, uterus, spleen, liver, heart, thoracic vertebrae, eye and the thoracic and abdominal cavities demonstrated lymphoma at necropsy. Bovine enzootic leucosis was confirmed by histopathology and agar gel immunodifusion.

A leucose enzoótica bovina é uma doença infecciosa de bovinos causada pelo vírus da leucemia bovina que produz linfoma em tecidos alvos. Bovinos podem demonstrar quatro manifestações clínico-patológicas da doença relacionadas à idade: forma juvenil, adulta, tímica e cutânea. Esse artigo descreve a manifestação incomum dessa doença em uma vaca de quatro anos de idade. Os linfonodos regionais apresentaram-se aumentados no exame clínico. Linfoma foi observado nos linfonodos periféricos e internos bem como na vagina, útero, baço, fígado, coração, vértebras torácicas, olho e nas cavidades torácica e abdominal durante a necropsia. A leucose enzoótica bovina foi confirmada na histopatologia e pela imunodifusão em gel de ágar.

Fases intermedias y simultáneas de los síndromes crónicos de la intoxicación por consumo de genotipos del Pteridium en bovinos / Intermediate and simultaneous phases of the chronic syndromes of the poisoning by ingestation of genotypes of the Pteridium in bovines

Fueron estudiados tres bovinos adultos, hembras, provenientes de una propiedad rural semi extensiva y tradicional del municipio Roncador, estado de Paraná, Brasil que presentaron neoplasias simultáneas en vejiga urinaria y tracto digestivo anterior, asociadas al consumo espontáneo de genotipos del Pteridium. La edad de los animales varió entre cinco y medio a siete y medio años. La sintomatología clínica observada incluyó: pérdida de la condición corporal y emaciación progresiva; disnea y respiración ruidosa; aumento del volumen externo a nivel orofaríngeo, disfagia relativa, salivación y halitosis; y hematuria intermitente o microhematuria. Los principales hallazgos macro y microscópicos interesaron la lengua, orofaringe, esófago, cardias y vejiga urinaria, consistiendo en papilomas, papilomas en fase de transformación para carcinomas y carcinomas de las células escamosas. Correspondiendo a lesiones malignas las de ubicación más anterior (lengua y orofarínge) y benignas, el resto. A nivel de lengua y orofaringe se observó evolución maligna de papilomas a carcinoma de las células escamosas con diverso grado de diferenciación celular y carcinoma epidermoide invasivo bien caracterizado. En esófago, se diagnosticó papiloma escamoso, mientras en vejiga urinaria se evidenciaron lesiones múltiples de carácter erosivo y/o papilar. Las lesiones papilomatosas, variables en número y tamaño, contenían tres fases de desarrollo: incipiente, activo y en regresión. Las evidencias epidemiológicas, clínicas, macro e histomorfológicas refuerzan las observaciones que sugieren que los signos y lesiones corresponde a fases y/o síndrome de una misma patología, determinada por el consumo de genotipos del Pteridium; intoxicación, que ocurre como respuestas a una compleja relación epidemiológica multifactorial, donde una estrecha correlación entre los principios tóxicos del helecho y la infección por Papilomavirus bovino, parece jugar importante papel en la patogénesis de tumores...

Three adult female bovines coming from a semi extensive and traditional property located at the Roncador Municipality, Paraná State, Brazil, were studied due to they presented simultaneous neoplasias in urinary blaster and upper alimentary syndrome associated to the spontaneous consumption of the Pteridium genotype. The animal’s age varied between five years and a half and seven years and a half. The clinical symptomatology seen included: body conditions loss, progressive emaciation, dyspnea and noisy breathing, rise of the external volume in oropharynx level, relative disphagia, salivation and halitosis; and intermittent hematuria or microhematuria. The main findings macro and microscopical were important in tongue, esophagus, oropharynx, cardia and urinary blaster consisting of papillomas, papillomas in transition to carcinomas and squamous cells. Of then, the upper locations (tongue and oropharynx) were considered malignant injuries and benign the rest. To the tongue and oropharynx level a malignant transition of squamous cells from papillomas to carcinoma was seen. In esophagus, squamous papilloma was diagnosed, meanwhile in urinary blaster multiple injuries with erosive and/or papillary character were present. It is peculiarized by a diverse degree of cellular differentiation and invasive epidermoide carcinoma well characterized. The papilomatosive injuries, irregular in number and size, were constituted by three development phases: incipient, active and in regression. Epidemiological, clinical, macro and histomorfological findings support other researchers‘ papers that suggest that the signs and injuries match with phases and/or a same pathology‘s syndromes, determined by the consumption of the Pteridium genotype. The intoxication can be seen as a direct answer to a complex multifactorial epidemiologic relation, where there is a narrow connection between the toxic principles of the bracken fern and the infection for bovine papillomavirus...