Chondrosarcomas are common tumors of the canine appendicular and axial skeleton; however, extraskeletal chondrosarcomas are very rare. Herein we report a case of extraskeletal chondrosarcoma in the tongue of a dog. Histologically, glossal skeletal muscle was infiltrated and effaced by islands of cartilage and streams of spindle-shaped cells. Retrospective analysis of 236 tongue masses submitted to the Iowa State University surgical biopsy service between 2011 and 2019 showed that the majority of submitted tongue masses are either non-neoplastic or benign, with granular cell tumors identified as the most prevalent benign neoplasms. Malignant tumors accounted for nearly 30% of all submitted masses, with malignant melanoma diagnosed most frequently.

中文翻译：

---

狗舌的骨骼外软骨肉瘤：236例舌肿的病例报告和回顾性分析（2011-2019）。

软骨肉瘤是犬的阑尾和轴向骨骼的常见肿瘤。但是，骨骼外软骨肉瘤非常罕见。在这里，我们报告一例狗舌上的骨骼外软骨肉瘤。组织学上，光泽的骨骼肌被软骨岛和梭形细胞流浸润并消失。对2011年至2019年间向爱荷华州立大学外科活检服务提交的236例舌头肿块进行的回顾性分析显示，提交的大多数舌头肿块是非肿瘤性或良性的，其中颗粒细胞瘤被确定为最普遍的良性肿瘤。恶性肿瘤占所有提交肿块的近30％，其中恶性黑色素瘤的诊断频率最高。