Histopathological Study of Hepatic Small Nodular Lesions on Slaughtered Cattle in Hokkaido

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  • SAKUI Mutsuko
    Hokkaido Obihiro Meat Inspection Center, Tokachi General Sub-prefectural Bureau, Hokkaido Prefectural Government
  • OONO Hiroshi
    Hokkaido Higashimokoto Meat Inspection Center, Abashiri General Sub-prefectural Bureau, Hokkaido Prefectural Government
  • OONISHI Ayae
    Hokkaido Higashimokoto Meat Inspection Center, Abashiri General Sub-prefectural Bureau, Hokkaido Prefectural Government
  • OKU Yuzaburo
    Joint Department of Veterinary Medicine, Faculty of Agriculture, Tottori University

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  • 牛の肝臓にみられた小結節病巣の病理組織学的検索
  • ウシ ノ カンゾウ ニ ミラレタ ショウケッセツ ビョウソウ ノ ビョウリ ソシキガクテキ ケンサク

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Abstract

Hepatic small nodular lesions associated with alveoral echinoccosis have been observed in the past on slaughtered pigs and horses in Hokkaido Prefecture, but no previous record exists of similar lesions on cattle. In this study, we carried out histopathological analysis of the hepatic small nodular lesions collected from 36 slaughtered cattle in Hokkaido. Histopathologically, a nematode or a nematode-like structure was detected on the center of the necrotic nest in five cases, which were suspected to be Setaria digitata, Calodium hepaticum or Calodium-like parasites, and an unidentified nematode. Also, lesions associated with botryomycosis and mycotic granuloma were found in each case. All of the other nodular lesions were diagnosed as either a parasitic eosinophilic granulomatous lesion, a micro-abscess, a lymphoid follicle formation, a cholangitis, a nodular hyperplasia, a fat necrosis, or a chronic granuloma. In this study, Echinococcus multilocularis was not detected in the hepatic nodular lesions of the slaughtered cattle in Hokkaido Prefecture.

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