The clinical and pathological findings of intestinal obstruction caused by phytobezoars in cattle consuming Stylosanthes sp. on three farms in Mato Grosso, Brazil, are described. The morbidity varied from 3.3 to 15% and the mortality was 100%. The animals stayed on pastures with predominance of Stylosanthes sp. for at least 60 days. The overall clinical picture was apathy followed by episodes of diarrhea or reduced feces and separation from the herd. Individual clinical signs were abdominal colic characterized by anorexia, discomfort, gastrointestinal hypomotility, dehydration, increased abdominal size, sweating, vocalization, sternal or lateral recumbence with the head on the flank. The clinical course lasted from 2 to 7 days. At necropsy, duodenal or pyloric obstruction was caused by ovoid phytobezoars of 2-4cm diameter; in the area of obstruction friable intestinal tissue with intense swelling, congestion, edema, and reddish mucosa was found. The rumen, abomasum and duodenum proximal to the site of obstruction was filled with greenish liquid, and absence of food contents was observed distally to the phytobezoars. Histologically, at the site of obstruction, the duodenum exhibited diffuse necrosis of the mucosal surface, thickening of the wall by submucosal edema, neutrophilic infiltration, fibrin deposition, necrosis of smooth muscle fibers, and marked congestion or hemorrhage. Pasture with the predominance of Stylosanthes sp. is a serious problem due to the possibility of phytobezoar formation, thus leading to intestinal obstruction and high mortality rates in cattle. nal por fitobezoares em bovinos que pastoreavam em piquetes com predomínio de Stylosanthes sp. pelo menos 60 dias. A morbidade variou de 3,3% a 15% e a mortalidade foi de 100%. O quadro clínico foi de cólica abdominal caracterizado por apatia, anorexia, inquietação, desconforto, sudorese e vocalização, seguido por episódios de diarreia ou diminuição da produção fecal, desidratação, hipomotilidade gastrintestinal, aumento do volume abdominal, decúbito esternal ou lateral com a cabeça voltada para o flanco e morte. O curso clínico foi de 2-7 dias. A principal alteração notada durante a necropsia dos bovinos foi a obstrução intestinal por fitobezoar ovoide de 2-5 cm de diâmetro, frequentemente no duodeno, próximo ao piloro, ocasionalmente em sua porção média. Na área de obstru-
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