Abstract：
OBJECTIVE: To make surgeons aware of the differing types of preauricular sinuses (PAS), we summarize our experience with diagnosis and treatment of varying types of PAS.
METHODS: We retrospectively reviewed clinical data from patients who had undergone preauricular fistulectomy between March 2015 and March 2020. These patients were categorized into two groups according to locations of congenital fistula pit.
RESULTS: Twelve patients with variant PAS accounted for 6.8% (12/177) of all patients. The variant types of PAS could be classified into three types (from type 1 to type 3), based on the location of the fistula pit. Type 1 (seven patients; eight ears) patients had pits located on the ascending helix crus, whereas type 2 (four patients, four ears) and type 3 (one patient, one ear) patients had pits located on the external auditory canal (EAC) and lobule, respectively. Fistular tracts penetrated the cartilage of the helix crus in seven of the type 1 variant ears. Swelling and discharge were located at the ascending helix crus (in four ears), cavum concha (in two ears), and posterior to the auricle (in one ear). In four of the type 2 ears, the fistular tracts were located at the anterior margin of the ascending limb of the helix.
CONCLUSIONS: Fistula tracts where fistula pit occurred on the ascending helix crus were more likely to penetrates through the cartilage, and fistula tracts with fistula pits that occurred on the EAC were adjacent to the cartilage of the ascending helix and tragus. Meticulous dissection and complete removal of fistula tissue are critical to avoid postoperative recurrence.
METHODS: 4 Laryngoscope, 134:3839-3845, 2024.
METHODS: We retrospectively reviewed clinical data from patients who had undergone preauricular fistulectomy between March 2015 and March 2020. These patients were categorized into two groups according to locations of congenital fistula pit.
RESULTS: Twelve patients with variant PAS accounted for 6.8% (12/177) of all patients. The variant types of PAS could be classified into three types (from type 1 to type 3), based on the location of the fistula pit. Type 1 (seven patients; eight ears) patients had pits located on the ascending helix crus, whereas type 2 (four patients, four ears) and type 3 (one patient, one ear) patients had pits located on the external auditory canal (EAC) and lobule, respectively. Fistular tracts penetrated the cartilage of the helix crus in seven of the type 1 variant ears. Swelling and discharge were located at the ascending helix crus (in four ears), cavum concha (in two ears), and posterior to the auricle (in one ear). In four of the type 2 ears, the fistular tracts were located at the anterior margin of the ascending limb of the helix.
CONCLUSIONS: Fistula tracts where fistula pit occurred on the ascending helix crus were more likely to penetrates through the cartilage, and fistula tracts with fistula pits that occurred on the EAC were adjacent to the cartilage of the ascending helix and tragus. Meticulous dissection and complete removal of fistula tissue are critical to avoid postoperative recurrence.
METHODS: 4 Laryngoscope, 134:3839-3845, 2024.
摘要：
目的：为了使外科医生了解不同类型的耳前窦（PAS），我们总结了不同类型PAS的诊断和治疗经验。
方法：我们回顾性分析了2015年3月至2020年3月期间接受耳前瘘切除术患者的临床资料。根据先天性瘘管坑的位置将这些患者分为两组。
结果：12例变异型PAS患者占所有患者的6.8%（12/177）。PAS的变体类型可以分为三种类型（从类型1到类型3）。根据瘘管坑的位置.1型（7名患者；8只耳朵）患者的上升螺旋小腿上有凹坑，而2型(四名患者，四只耳朵)和3型(一名患者，一只耳朵）患者的外耳道（EAC）和小叶上有凹坑，分别。在7个1型变种耳朵中，瘘管穿透了螺旋小腿的软骨。肿胀和放电位于上升的螺旋小腿（四只耳朵），cavumconcha（在两只耳朵中），耳廓后方（一只耳朵）。在四只2型耳朵中，瘘管位于螺旋上升肢的前缘。
结论：在上升螺旋腿上发生瘘管坑的瘘道更有可能穿透软骨，EAC上发生的具有瘘管凹坑的瘘管束与上升螺旋和耳屏的软骨相邻。精心解剖和彻底切除瘘管组织对于避免术后复发至关重要。
方法：第4级。喉镜,2024.
方法：我们回顾性分析了2015年3月至2020年3月期间接受耳前瘘切除术患者的临床资料。根据先天性瘘管坑的位置将这些患者分为两组。
结果：12例变异型PAS患者占所有患者的6.8%（12/177）。PAS的变体类型可以分为三种类型（从类型1到类型3）。根据瘘管坑的位置.1型（7名患者；8只耳朵）患者的上升螺旋小腿上有凹坑，而2型(四名患者，四只耳朵)和3型(一名患者，一只耳朵）患者的外耳道（EAC）和小叶上有凹坑，分别。在7个1型变种耳朵中，瘘管穿透了螺旋小腿的软骨。肿胀和放电位于上升的螺旋小腿（四只耳朵），cavumconcha（在两只耳朵中），耳廓后方（一只耳朵）。在四只2型耳朵中，瘘管位于螺旋上升肢的前缘。
结论：在上升螺旋腿上发生瘘管坑的瘘道更有可能穿透软骨，EAC上发生的具有瘘管凹坑的瘘管束与上升螺旋和耳屏的软骨相邻。精心解剖和彻底切除瘘管组织对于避免术后复发至关重要。
方法：第4级。喉镜,2024.
