A Spontaneous Epithelial-Myoepithelial Carcinoma of the Submandibular Gland in a Sprague-Dawley Rat

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  • Li Yinghua
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Kim Hak-Soo
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Kang Min-Soo
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Shin Seo-Ho
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Koo Kyo-Hwan
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Kim Chul-Min
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Kim Kap-Ho
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Peck Charles
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
  • Bae Han-Ik
    Department of Pathology, Kyungpook National University Medical Center, 474 Hakjeongdong, Buk-gu, Daegu 702-210, Republic of Korea
  • Jeong Ji Yun
    Department of Pathology, Kyungpook National University Medical Center, 474 Hakjeongdong, Buk-gu, Daegu 702-210, Republic of Korea
  • Kang Jin Seok
    Department of Biomedical Laboratory Science, Namseoul University, Cheonan, Chungcheongnam-do 331-707, Republic of Korea
  • Kang Boo-Hyon
    Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea

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The present report describes a rare case of spontaneous tumor of the salivary gland in a male Sprague-Dawley rat. The clinically confirmed mass rapidly developed in the cervical region between 19 and 21 weeks of age, and the animal was subsequently euthanized. At necropsy, a well-circumscribed nodule approximately 7 × 6 cm in diameter was found at the site of the salivary gland. The cut surface of the nodule was lobulated and soft and had a pinkish tan fish-flesh appearance. One large cyst (approximately 3 × 2 cm in size) containing reddish fluid was also present in the nodule. Histopathologically, the tumor, with a partially lobulated structure, was surrounded by a thin fibrous capsule. The majority of tumor cells formed a diffuse solid sheet structure that mainly consisted of small ovoid or spindle-shaped cells. In the tumor periphery, some cells were arranged in nest-like structures. Small duct-like structures lined with a monolayer of cuboidal epithelial cells resembling an intercalated duct or large polygonal clear cells with a myoepithelial component were also observed. Mitotic figures and necrotic foci were frequently observed in solid areas. Immunohistochemically, the tumor cells were positive for cytokeratin, epithelial membrane antigen, vimentin, p63, α-smooth muscle actin and calponin. The cells were negative for calcitonin, synaptophysin and chromogranin A. On the basis of these findings, the tumor was diagnosed as an epithelial-myoepithelial carcinoma originating from the luminal epithelial cells and myoepithelial cells in the submandibular gland.

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