Mandibular Osteoma in a Brown Bear (Ursus arctos)

Year 2017, Volume: 36 Issue: 1-2, 37 - 39, 25.12.2017

M. Özgür Özyiğit , Huseyin Cihan , Nilufer Aytuğ

https://doi.org/10.30782/uluvfd.406218

Abstract

       A 21-year old, 150-kg male Brown bear, kept in Karacabey Bear Sanctuary
in Bursa, Turkey, (Ursus Arctos) with
an osteoma of the left mandible is presented. A large mass, causing significant
facial asymmetry, on the mandible was detected. On palpation, the mandibular
mass was very firm and immobile. Macroscopically the mass was non-hyperemic,
spherical and smoothly contoured, whitish colored, hard and was 9 cm in diameter and covered
by gingival mucosa. Microscopically, the tumoral mass on the mandible was
covered with a layer of keratinized squamous epithelium. In deeper layers, bony
islands of various shape and size were encountered. Some of them were compact,
while some of them were trabecular. No mitotic figures were observed. The
clinical and pathological findings were found compatible with osteoma.

Keywords

Brown bear, mandible, osteoma, pathology, Ursus arctos

Kahverengi ayıda mandibular osteoma olgusu

Abstract

Bu çalışmada, Bursa'nın Karacabey Ayı Koruma Barınağında
bulunan 21 yaşındaki 150 kg ağırlığında erkek bir kahverengi ayıda (Ursus
Arctos), sol mandibulada bulunan  osteoma
tümörü tanımlanmıştır. Mandibulada belirgin yüz asimetrisine neden olan kitle palpasyonda,
sert ve hareketsizdi. Makroskopik olarak kitle hiperemik olmayan, küresel ve
düzgün şekilli, beyazımsı renkli, sert ve 9 cm çapındaydı ve diş eti mukozası
ile örtülmüştü. Mikroskobik olarak, mandibuladaki tümöral kitle, keratinize
skuamöz epitel tabakası ile kaplıydı. Epitel tabakasının altında, çeşitli şekil
ve büyüklükteki kemik doku adalarına rastlandı. Kemik dokunun kompakt ve trabeküler
yapıdan oluştuğu görüldü. Alanda mitotik figürlere rastlanmadı. Yapılan klinik
ve patolojik bulgular osteomayla uyumlu bulundu.

Keywords

Kahverengi ayı, mandibula, osteoma, patoloji, Ursus arctos

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