01982naa a2200313 a 450000100080000000500110000800800410001910000170006024501130007726000090019052010970019965000130129665000290130965000140133865000120135265000140136465300140137865300140139265300200140665300200142670000170144670000200146370000200148370000160150370000220151970000200154170000190156177300880158020508482016-08-15       2016    bl uuuu     u00u1 u    #d1 aMOTTA, R. G.  aUnusual caudal vena cava thrombosis in a cow, secondary to Trueperella (Arcanobacterium) pyogenes infection.  c2016  aThe caudal vena cava thrombosis, or pulmonary thromboembolism, in cattle is correlated with lactic acidosis, caused by diets rich in grains and highly fermentable, associated or not to septic situations, used in feedlots of beef or high-producing dairy cattle. This paper reports an unusual caudal vena cava thrombosis in a cow, secondary to Trueperella (Arcanobacterium) pyogenes infection, resulting in reduced milk production, anorexia, pale mucous membranes, ruminal atony, sternal decubitus and autoauscultation position. The heart was enlarged at necropsy, presence of clots distributed along the thoracic cavity, adherence between lung and pleura, abscesses, emphysema, petechiae, suffusions and ecchymosis in lungs, thickening of the caudal vena cava wall, hepatomegaly with chronic passive congestion (?nutmeg? aspect), and rumenitis. In lab, the actinomycete Trueperella (Arcanobacterium) pyogenes was isolated from liver and lung samples, probably resulting through dissemination of the bacteria of the rumen content, what reaffirms the opportunistic behavior of this actinomycete.  aAcidosis  aArcanobacterium pyogenes  aRuminants  aAcidose  aRuminante  aAbscesses  aAbscessos  aThromboembolism  aTromboembolismo1 aMOTTA, I. G.1 aMARTINEZ, A. C.1 aSILVA, A. V. da1 aPAES, A. C.1 aMARTINS, L. S. A.1 aSILVA, R. C. da1 aRIBEIRO, M. G.  tPesquisa Veterinária Brasileira, Brasília, DFgv.36, n. 7, p. 587-590, jul. 2016.