[Clinical characteristics and surgical treatment of types Ⅱ to Ⅳ external auditory canal cholesteatoma].

The aim of this study is to explore the clinical characteristics,diagnostic methods,surgical procedures and results of typesⅡ to Ⅳexternal auditory canal cholesteatoma.In the 63 cases,there were 39 patients suffering typeⅡexternal auditory canal cholesteatoma,22 patients suffering typeⅢ and 2 patients suffering type Ⅴ.All patients had surgeries to remove the lesion under the microscope,and underwent canaloplasty or tympanoplasty or modified mastoidectomy as well.There were 2 cases occurred meatal stenosis postoperatively ,as well as 2 cases of cholesteatoma recurrenced,and were cured after second operation.Four patients'hearing level were not improve postoperatively due to the severe damage of their ossicular chain.All other patients were cured with one operation,which the cavity with good skin coverage and there has been no recurrence.Temporal bone CT scan has important significance in the diagnosis and classification of external auditory canal cholesteatoma.Prevention and early diagnosis are particularly important.Surgical treatment should completely remove the lesion,restore hearing according to the situation,and appropriate surgical treatment should be taken according to the classification,location of external auditory canal cholesteatoma as well as hearing level of patients.