A 6-year-old Cleveland Bay mare was referred to the University of Liverpool Equine Hospital for repair of an iatrogenic nasocutaneous fistula. The fistula had developed following attempted ablation of an epidermal inclusion cyst located in the right nasal diverticulum with intra-lesional formalin 6 weeks previously. Subsequent tissue necrosis resulted in the formation of a full-thickness defect in the overlying tissues and the creation of a 5 × 5 cm nasocutaneous fistula. Surgical management consisted of initial debridement of the fistula and use of a commercial dermal regeneration mesh to bridge the defect, acting as a tissue scaffold. The levator labii superioris muscle was utilised to cover the scaffold by transecting it close to its proximal origin and reflecting it rostrally. Finally, a transposition skin flap was created adjacent to the site and was rotated to cover the defect. The mare made an excellent recovery, and follow-up confirmed complete healing of the surgical site with an excellent cosmetic outcome.

中文翻译：

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病灶内注射福尔马林后鼻瘘的手术修复和重建

一头 6 岁的克利夫兰湾母马被转诊到利物浦大学马医院，以修复医源性鼻皮肤瘘。在 6 周前尝试用病灶内福尔马林消融位于右侧鼻憩室的表皮包涵囊肿后，形成了瘘管。随后的组织坏死导致上覆组织形成全层缺损，并形成 5 × 5 cm 的鼻皮肤瘘。手术治疗包括瘘管的初步清创和使用商业真皮再生网来弥合缺损，充当组织支架。在提上唇肌肌肉被用来覆盖支架，方法是在靠近其近端起点处横切支架并将其反射到嘴部。最后，在该部位附近制作一个换位皮瓣并旋转以覆盖缺损。这匹母马恢复良好，随访证实手术部位完全愈合，美容效果极佳。