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Perivertebral B-Cell Lymphoma in a Queensland Koala (Phascolarctos cinereus adustus) with Paralytic Symptoms in the Hind Limbs

Nobuhide KIDO1,2)*, Kazuya EDAMURA3), Naomi INOUE4), Hisashi SHIBUYA4), Tsuneo SATO4), Masako KONDO1,2) and Izumi SHINDO1)

1)Kanazawa Zoological Gardens, 5–15–1 Kamariya-higashi, Kanazawa-ku, Yokohama, Kanagawa 236–0042, Japan
2)Nogeyama Zoological Gardens, 63–10 Oimatsu cho, Nishi-ku, Yokohama, Kanagawa 220–0032, Japan
3)Laboratory of Veterinary Surgery, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252–0880, Japan
4)Laboratory of Veterinary Pathology, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252–0880, Japan

ABSTRACT
A male Queensland koala (Phascolarctos cinereus adustus) at Kanazawa Zoological Gardens (Kanagawa, Japan) exhibited paralytic symptoms in the hind limbs. Computed tomography and magnetic resonance imaging revealed a mass on the left ventral side of the 11th to 13th thoracic vertebrae, and the presence of myelitis or edema in the spinal cord. The koala was under anesthesia during the examination and suddenly developed ventricular fbrillation and died. Necropsy revealed a frm flat ovoid hemorrhagic mass on the vertebrae. Following a microscopic examination including immunohistochemistry, the perivertebral mass was diagnosed as B cell lymphoma. Therefore, neoplastic cell infltration into the spinal cord may cause paralytic symptoms in the hind limbs.

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