Gingival vascular hamartoma in a neonatal calf
2017
Hashida, A. (Okayama Prefectural Okayama Livestock Hygiene Service Center, Okayama (Japan)) | Yamada, M. | Mitsumune, H. | Mito, Y.
A neonatal Japanese Black calf (three-days-old) showed signs of anorexia. Clinical examination revealed a thumb-sized mass on the lingual area in relation to the right incisor of the mandible. Two days later, the mass was surgically removed and examined pathologically. Macroscopically, the mass had a nipple-shaped and segmented appearance with an off-white or tan-colored surface, and the gingival border appeared reddish. On palpation, it was soft. Histopathologically, the mass was composed of a proliferation of smaller blood vessels with irregular lumens and an increased number of well-differentiated vascular endothelial cells. Although these cells were oval-shaped and showed protrusion into the lumens, cellular atypia and mitotic figures were not observed. A proliferation of stromal cells with slight mucous was present in the edematous stromal tissues. On the basis of the histological findings, in this case a vascular hamartoma was diagnosed. This is the first case report of a vascular hamartoma in the gingiva of cattle in Japan.
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