Tierklinik Lüsche GmbH, Bakum, Germany.
Department of Pathology, Faculty of Veterinary Medicine, University of Khartoum, Khartoum, Sudan.
J Equine Vet Sci. 2020 Nov;94:103223. doi: 10.1016/j.jevs.2020.103223. Epub 2020 Aug 14.
An 18-year-old Quarter Horse mare was evaluated because of moderate left forelimb lameness of 4 weeks' duration. The clinical evaluation and diagnostic perineural analgesia localized the lameness to the distal portion of the left forelimb. There was swelling on the dorsal and lateral aspect of the coronary band. Radiography, ultrasound, magnetic resonance imaging, and computed tomography of the foot revealed circumscribed well-capsulated soft tissue mass causing a focal deformation of the dorsolateral border of the middle phalanx. The treatment aimed to remove the mass surgically and stabilized the interphalangeal joint, but the owner elected human euthanasia before treatment attempt. Histopathology diagnosis was an epidermoid cyst, which was characterized by multilayers of keratin surrounded by stratified squamous epithelium. Although rare, an epidermoid cyst should be considered as a differential diagnosis for space-occupying mass in horses' foot that develops chronic lameness after trauma. This report describes the multimodality appearance of the epidermoid cyst.
一匹 18 岁的夸特马母马因左前肢中度跛行 4 周而接受评估。临床评估和神经周围镇痛定位跛行发生在左前肢的远端。冠状带的背侧和外侧有肿胀。足部的 X 线摄影、超声、磁共振成像和计算机断层扫描显示出界限清楚的、包膜完整的软组织肿块，导致中趾骨的背外侧缘出现局灶性变形。治疗目的是通过手术切除肿块并稳定指关节，但在治疗尝试前，主人选择了人道安乐死。组织病理学诊断为表皮样囊肿，其特征是多层角蛋白被复层鳞状上皮包围。尽管罕见，但对于创伤后出现慢性跛行的马足部占位性病变，应考虑表皮样囊肿作为鉴别诊断。本报告描述了表皮样囊肿的多种模态表现。
