외이도 편평상피암종의 치료 경험
Squamous Cell Carcinoma of the External Auditory Canal：Treatment Results of 15 Cases
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Abstract
Background and Objectives：The management of external auditory canal (EAC) squamous cell carcinoma (SCC) is very dif-ficult because the structure of the temporal bone is complicated. We aimed to analyze the surgical results of EAC SC and propose a treatment protocol. Subjects and Method：Fifteen patients with EAC SCC who underwent operations betwen July 1984 and as-sified under Class I, the tumor involved the cartilaginous ear canal. Tumors of patients within Clas II involved the bony ear canal or mastoid cortex. Tumors that involved the deep structures of the temporal bone but limited involvement of within the middle ear cavity were classified under Clas IIA. In Class IIB, tumors involved the facial canal, the base of the skull, or mastoid air cells. In Class IIC, tumors involved the cochlea, the medial wal of middle ear, dura, sigmoid sinus, or other structures such as the parotid . Results：The number of patients classified under Class I, Class I, Class IA, Class IB and Class IC were 3, 2, 1, and 6, res-pectively. Surgical approaches were local canal resection, partial temporal bone resection (TBR), subtotal TBR, and total TBR. Folow up period was 5 to 138 months with a mean (± SD) of 40 months (± 37.5), and the five-year disease free survival rate was 40.6%. Conclusion：surgery of Clas I or Clas II EAC SC cancers, a subtotal TBR for Clas IIIA, and a total TBR when it is close to Clas IIIB or Clas IIIC.
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