Humeral Chondrosarcoma in a Hokkaido Brown Bear (Ursus arctos yesoensis)

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  • MURAKAMI Tomoaki
    Laboratory of Veterinary Pathology, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan United Graduate School of Veterinary Sciences and Laboratory of Food and Environmental Hygiene, Department of Veterinary Medicine, Gifu University, Gifu 501–1193, Japan
  • KOBAYASHI Yoshiyasu
    Laboratory of Veterinary Pathology, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan
  • CHIBA Shiori
    Laboratory of Veterinary Pathology, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan
  • KURAUCHI Yuki
    Sahoro Resort Bear Mountain, Shintoku 081–0039, Japan
  • SAKAMOTO Hideyuki
    Noboribetsu Bear Park, Noboribetsu 059–0551, Japan
  • SASAKI Motoki
    Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan
  • MATSUI Takane
    Laboratory of Veterinary Pathology, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080–8555, Japan

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  • Humeral Chondrosarcoma in a Hokkaido Brown Bear (<i>Ursus arctos yesoensis</i>)

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Humeral chondrosarcoma was found in an 18-year-old male Hokkaido brown bear (Ursus arctos yesoensis). Necropsy revealed a large firm mass under the left superficial pectoral muscle at the axillary region. The mass involved the left shoulder joint and peripheral muscles, and connected to the head of the humerus with osteolysis. Histopathologically, the mass was composed of irregularly shaped myxomatous to cartilaginous tumor lobules. The tumor cell showed moderate nuclear atypia with a relatively high mitotic index, especially in the edges of the myxomatous lobules. The tumor cells were positively immunostained with vimentin and S-100 protein. Based on these findings, the tumors were diagnosed as chondrosarcoma. Metastases were found in the left axillary lymph node, lungs, liver and kidney.

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