先天性鳃裂瘘管或囊肿由胚胎时鳃裂残余发展形成，第一鳃裂瘘管或囊肿是由第一鳃沟发育异常所致，临床少见，Ａｒｎｏｔ（１９７１年）将此病分两型， Ｉ型外孔位于耳前或耳后，瘘道与外耳道平行，但不通外耳道内，故囊肿、窦道多在面神经外上方，现将遇到一例双耳前瘘管伴右侧 The congenital branchial fistula or cyst is formed by the remnants of the branchial gill fissure. The first branchial fistula or cyst is caused by the abnormal development of the first gill gut. It is rarely seen in clinical practice. Arnot (1971) divided the disease into two types: I Outer hole located in front of the ear or ear, the fistula and external auditory canal parallel, but not through the external auditory canal, so cysts, sinus and more in the facial nerve above, will now encounter a case of binaural fistula with right