This report describes a case of sudden lameness in an 18-year-old Percheron cross mare after presumably being kicked by another horse, and the subsequent formation of a ganglion cyst originating from the lateral femorotibial joint. Physical examination, radiographic and ultrasonographic investigation identified a soft round 5 cm diameter mass attached to the left lateral femorotibial joint. After surgical removal, histopathological examination confirmed a ganglion cyst. The horse responded well to the surgical removal of the cyst, and 4 weeks after the surgery, the mare has returned back to her same athletic performance. According to the authors’ knowledge, this is the first reported case that describes a peri-articular ganglion cyst originating from the stifle joint.

中文翻译：

---

18 岁 Percheron 交叉母马股胫外侧关节获得性关节周围神经节囊肿

这份报告描述了一个 18 岁的 Percheron 交叉母马在被另一匹马踢后突然跛足的情况，随后形成了源自股胫外侧关节的神经节囊肿。体格检查、放射照相和超声检查确定了附着在左侧股胫关节上的一个直径为 5 厘米的柔软圆形肿块。手术切除后，组织病理学检查证实为神经节囊肿。这匹马对手术切除囊肿反应良好，手术后 4 周，这匹母马恢复了同样的运动表现。据作者所知，这是第一个报告的病例，描述了起源于膝关节的关节周围神经节囊肿。