耳前瘘管 Preauricular sinus and cyst
（重定向自Preauricular sinus）
耳前廔管（Preauricular sinus），又称耳前窦，是一个先天性发育异常，患者在耳廓上方和脸交接处有一小洞，多数为单耳，有些是双耳，有时会有分秘物。大部份耳前廔管并没有症状，不需要治疗。若遭细菌感染则会流脓、肿痛，此时应手术切除。
耳前廔管是在胚胎发育的第六周第一对和第二对鳃弓愈合不完全而形成，属不完全的自体显性遗传，罹患率约1％。
Preauricular sinus
中文百科
英语百科
Preauricular sinus and cyst 耳前瘻管
（重定向自Preauricular sinus）
A preauricular sinus (also known as a congenital auricular fistula, a congenital preauricular fistula, an ear pit, or a preauricular cyst) is a common congenital malformation characterized by a nodule, dent or dimple located anywhere adjacent to the external ear. Frequency of preauricular sinus differs depending on race, 0.1-9% in the US, 0.9% in the UK, and 4-10% in Asia and parts of Africa. Frequency is known to be higher in Africans and Asians compared to caucasians.
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