The purpose of this study was to examine the selection criteria for planned tympanoplasty in pars tensa cholesteatoma and also to evaluate the postoperative outcome after S 2p tympanoplasty using a survival analysis. Out of 163 patients with pars tensa cholesteatoma treated with canal wall reconstructed tympanoplasty from January 1, 1991 to December 31, 2017, we included 29 patients with planned tympanoplasty. The follow-up period of patients was more than 1 year and the median period was 9

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... s 2 months after S 2p surgery. 1. Staged surgery was selected for the following reasons: (1) When one-stage surgery which was to be carried on ventilation and drainage, between the Eustachian tube and the reconstructed middle ear cavity was judged difficult to preserve the function. (2) When the residual cholesteatoma was suspected to be in areas with poor visual field, such as the tympanic sinus. (3) For the purpose of avoiding inner ear damage, cholesteatomas in dangerous sites were left on purpose during the S 1 surgery; for example, cholesteatomas with infectious granulation at the labyrinthine fistula. During the S 2p surgery, safe removal of cholesteatomas was attempted in a prepared infection-free environment. (4) To ensure ossicular chain repair, especially in the type of Oft. As a result, in the 29 ears of stage surgery, majority were complicated with severe conditions, such as infection, adhesive otitis, and labyrinthine fistula. 2. The postoperative outcome was evaluated using the following method: First, a disease-free case was one with postoperative air-bone gap maintained within 20 dB without a S 2r surgery. Therefore, the cumulative frequency of disease-free cases was visualized by the Kaplan-Meyer survival curve. We found no significant difference between the staged surgery group and the one-stage surgery group. Based on these results, we found a useful way of selecting staged surgery in cases with pars tensa cholesteatoma with severe pathological conditions. Key words: selection criteria, healthiness of reconstructed middle ear, residual cholesteatoma, survival analysis キーワード: 選択基準,再建中耳腔の健全性,遺残真珠腫,生存分析