چكيده لاتين :
We report five cases of duplicated external ear canal with especial
attention to its histology and surgical care of facial
nerve for their complete resection. These five patients were
selected from 50 cases of first bronchial cleft anomalies including
atretic external ear canals, preauricular fistula, cyst
and sinuses. The characteristic histopathology and clinical features
such as external opening around the auricle and upper
neck above the level of the hyoid bone were not observed in
other patients. There were no other abnormal ities in the real
external ear canal (EEC) and auricle. Three of them were connected
to the natural EEC with an opening, hence producing
ear discharges. Histologic appearances of well formed canal
included a circumferential epithelial lined up and canal consisting
of stratified squamous epithelium with skin adnexes. A
remarkable cartilaginous skeleton (type י2 of first branchial
cleft anomaly according to Workיs classifications) was also
observed. All of them were treated surgically, with preservation
of the facial nerve and excising the superficial parotid
gland along with the ductal opening and the tract.
