During the period, 47 (3.48%) out of 1.347 ascensions were reported as malformations. Based in the type of malformation and in the origin of the animals, malformations were divided in: 1) caused by the ingestion of M. tenuiflora, and 2) sporadic malformations of unknown causes. In sheep, 21 out of 418 ascensions were malformations, being 18 (4.3%) of malformations caused by M. tenuiflora and 3 (0.71%) of sporadic malformations. In cattle, 14 out of 434 ascensions were malformations, from these 8 (1.84%) were caused by M. tenuiflora and 6 (1.38%) were sporadic malformations. In goats, 12 out of 495 ascensions were malformations, being 9 (1.81%) malformations related with the ingestion of M. tenuiflora and 3 (0.6%) sporadic malformations. More frequent malformations caused by M. tenuiflora were arthrogryposis, micrognatia, palatoschisis, microphtalmia and unilateral or bilateral hypoplasia or aplasia of the incisive bones. Sporadic malformations were acephaly and hermaphrodite, dicephaly and malformations of mesenteric vessel in sheep; atresia ani in three goats; and hydranencephaly, atresia ani, ribs malformation with eventracion, cerebellar hypoplasia with hydrocephalus, pulmonary choristoma and meningocele, and siamese twins in cattle. A case of cerebellar hypoplasia with hydrocephalus was negative on immunohistochemistry to bovine viral diarrhea virus. Malformations caused by M. tenuiflora occurred during the whole year. The highest frequency in sheep seems to be associated with the consumption of the plant by ewes after first rains, in the first two months of gestation, when they are supplemented with concentrates, and M. tenuiflora is the main green forage available. Malformations occur mainly in degraded areas of native forest (caatinga) invaded by M. tenuiflora, with lesser variety of other species.INDEX TERMS: Congenital defects, teratogenic plants, poisonous plants, Mimosa tenuiflora, plant poisoning.

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IVCompressão medular em bovinos associada à vacinação contra febre aftosa Spinal cord compression in cattle associated whit vaccination against foot and mouth disease Recebido para publicação 01.12.11 Aprovado em 05.05.12 Devolvido pelo autor 20.07.12 CR-6413

Pulmonary choristoma is a rare malformation reported in different animal

We report exogenous pigmentation in sheep grazing in native pastures in northeastern

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Dogs are as considered important reservoirs of trypanosomiasis and play a vital role in maintaining the interaction between the domestic and wild cycles of this disease. This paper reports the clinical and pathological findings of a case of Chagas disease myocarditis in a dog from an urban area in Brazil. During clinical examination, the animal showed apathy, weakness and pale ocular mucous and died shortly after. Necropsy revealed ascites, hydrothorax and hydropericardium. The heart was remarkably globoid with scattered multifocal pale in the epicardium and ventricular miocardium and dilated chambers. Histological analysis revealed non-suppurative myocarditis and cardiomyocyte necrosis. The sarcoplasms of cardiomyocytes were frequently infiltrated by T. cruzi pseudocysts filled with amastigotes. The myocardium immunostained positive for anti-T. cruzi antibody. The presence of Chagas disease in a dog from an urban area increases the risk of disease transmission to man, which renders this diagnosis a matter of significant public health concern. Key words: Chagas disease, cardiomyopathy, zoonose, dog (Canis familiaris) ResumoOs cães são considerados importantes reservatórios de tripanosomose e têm um relevante papel na manutenção e interação entre o ciclo doméstico e silvestre desta doença. Neste trabalho é descrito as alterações clínicas e anatomopatológicas de miocardite chagásica em um cão, domiciliado em área urbana, no Brasil. Durante o exame clínico o animal apresentava apatia, debilidade e mucosas oculares pálidas, com rápida evolução para o óbito. Na necropsia foram observados ascite, hidrotórax e hidropericárdio. O coração estava globoso com áreas multifocais pálidas no epicárdio e miocárdio ventricular e ao corte observou-se dilatação das câmaras átrio-ventriculares. Histologicamente, no coração havia miocardite não supurativa e necrose de cardiomiócitos. exame de imuno-histoquímica, do miocárdio, houve imunomarcação positiva para o anticorpo anti-T. cruzi. A ocorrência da doença de Chagas em um canino domiciliado em área urbanizada eleva os riscos de transmissão da doença para o homem, o que consequentemente torna este diagnóstico uma nota de importância em saúde pública e de diferencial para outras patologias caninas. Palavras-chave: Doença de chagas, cardiomiopatia, zoonose, cão (Canis familiaris)