title: Cluster of cases of malignant schwannoma in cattle.
abstract: Between 1998 and 2001, several cases of ataxia and paresis followed by recumbency and death were reported in cows from different farms in a restricted area of the Argentinian Patagonia. Five cases of this cluster were studied and a diagnosis of malignant schwannoma was established. Electron microscopy (em) of tumour samples from three of the animals revealed intracytoplasmic or interstitial structures resembling retroviral particles. Attempts to isolate a viral agent from the tumours were unsuccessful but the epidemiological data and the em findings suggest a viral aetiology.
authors.affiliation: Virology Department, School of Veterinary Sciences, University of Buenos Aires, Buenos Aires, Argentina.
authors.forename: P R
authors.initials: PR
authors.lastname: Murcia
authors.forename: G
authors.initials: G
authors.lastname: Delhon
authors.forename: M J
authors.initials: MJ
authors.lastname: González
authors.forename: M
authors.initials: M
authors.lastname: Vilas
authors.forename: J A
authors.initials: JA
authors.lastname: Ramos-Vara
authors.forename: M
authors.initials: M
authors.lastname: De Las Heras
authors.forename: R W
authors.initials: RW
authors.lastname: Nordhausen
authors.forename: F A
authors.initials: FA
authors.lastname: Uzal
mesh_terms: D000818:Animals; D001118:Argentina; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology* / Q000821:virology; D005260:Female; D008854:Microscopy, Electron / Q000662:veterinary; D009442:Neurilemmoma / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary* / Q000821:virology; D012190:Retroviridae / Q000648:ultrastructure; D013120:Spinal Cord Neoplasms / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary* / Q000821:virology; D013126:Spinal Nerve Roots / Q000473:pathology