5 research outputs found
Facial paralysis and vestibular syndrome in feedlot cattle in Argentina Paralisia facial e sĂndrome vestibular de bovinos em confinamento
This paper reports 6 outbreaks of neurological disease associated with paralysis of the facial and vestibulocochlear nerves caused by intracranial space occupying lesions in feedlot cattle. The clinical signs observed were characterized by head tilt, uni or bilateral drooping and paralysis of the ears, eyelid ptosis, keratoconjunctivitis, and different degrees of ataxia. Morbidity and mortality rates ranged from 1.1 to 50% and 0 to 1%, respectively. Gross lesions observed included yellow, thickened leptomeninges, and marked enlargement of the roots of cranial nerves VII (facial) and VIII (vestibulocochlear). Histopathologically, there was severe, chronic, granulomatous meningitis and, in one case, chronic, granulomatous neuritis of the VII and VIII cranial nerves. Attempts to identify bacterial, viral, or parasitic agents were unsuccessful. Based on the morphologic lesions, the clinical condition was diagnosed as facial paralysis and vestibular syndrome associated with space occupying lesions in the meninges and the cranial nerves VII and VIII. Feedlot is a practice of growing diffusion in our country and this is a first report of outbreaks of facial paralysis and vestibular disease associated with space occupying lesions in Argentina.<br>Descrevem-se 6 surtos de uma doença neurolĂłgica com paralisia dos nervos facial e vestibulo-coclear causada por lesões intracraniais que ocupam espaço em bovinos em confinamento. Os sinais clĂnicos foram desvio da cabeça, queda e paralisia das orelhas, ptose palpebral, ceratoconjuntivite e diferentes graus de ataxia. As taxas de morbidade e mortalidade foram de 1.1%-50% e de 0-1%, respectivamente. As lesões macroscĂłpicas incluĂram engrossamento das meninges, que se apresentavam amareladas, e marcado engrossamento das raĂzes dos nervos cranianos VII (facial) e VIII (vestĂbulo-coclear). Histologicamente observaram-se meningite crĂ´nica granulomatosa e, em um caso, neurite granulomatosa crĂ´nica do VII e VIII pares cranianos. Cultivos para bactĂ©rias ou vĂrus resultaram negativos. De acordo com as lesões observadas o quadro clĂnico foi diagnosticado como paralisia facial e sĂndrome vestibular associadas a lesões que ocupam espaço nas meninges e nervos cranianos VII e VIII. O confinamento Ă© uma prática em expansĂŁo na Argentina e este Ă© o primeiro relato, neste paĂs, de surtos de paralisia facial e sĂndrome vestibular associados com lesões que ocupam espaço