外傷性外耳道閉鎖症の2例

Two Cases of Acquired Atresia of the External Ear Canal

I．はじめに

　外耳道閉鎖症は小耳症に合併してみられる先天性のものと外陽，熱傷，感染症などに続発する後天性のものとがある。外傷では外耳道の挫創，切創，銃創，骨折などによるものであり，入口部付近の狭窄または閉鎖が多いと報告^1〜3）されている。われわれは外傷性外耳道閉鎖症に対し，充分なる瘢痕組織の除去と有茎弁による瘢痕拘縮の予防もしくは瘢痕拘縮を予想しての大きな外耳道の確保が必要なことを経験したので以下に述べる。

　In two cases of acquired atresia of the external ear canal, the cartilage portion was obstructed. In the first case, cholesteatoma-like substance was found in the portion medial to the obstruction. This case was treated with Lore's Z-plasty to correct the membranous atresia, and the external ear canal was reconstructed satisfactorily. In the second case, the obstructed part was resected and the external canal was reconstructed by Macomber I method and split skin grafting. However, a part of the external canal was obstructed again, so that a wide resection with split grafting was performed. Eventually, the hearing loss was improved in both cases.