A Case of Bovine Extraskeletal Osteosarcoma Characterized by Multiple Nodular Mass in the Abdominal Cavity

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  • SUTO Asuka
    Shounai Meet Inspection Center, Yamagata, Japan Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
  • IWATA Ryuji
    Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
  • KIMITSUKI Kazunori
    Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
  • BOONSRIROJ Hassadin
    Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University
  • PARK Chun-Ho
    Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University

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  • 腹腔内の多発性結節性腫瘤を特徴とする牛の骨外性骨肉腫の1例
  • フクコウ ナイ ノ タハツセイ ケッセツセイ シュリュウ オ トクチョウ ト スル ウシ ノ ホネ ガイセイコツ ニクシュ ノ 1レイ

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Abstract

Japanese black cattle (16-years-old and an 8-month-old female), which was clinically diagnosed with mesenteric fat necrosis, was presented to the meat inspection center. At dismantling, multiple white nodules were found on the serosal surface of the liver, spleen, omentum, diaphragm, abdominal wall and lungs. Grossly, nodular lesions were not observed in the pre-existing bone tissue. Histopathologically, all of the tumors were composed of osteoid trabecula and osteoblastic tumor cells. Tumor cells showed low cell atypia and occasional mitotic figures, but there was metastasis in the lungs. Immunohistochemically, tumor cells showed positive reaction to osteopontin, keratin sulfate, S-100 and vimentin. Based on these findings, the present case was diagnosed as extraskeletal osteosarcoma which is relatively rarely reported in cattle.

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