Conclusion: Based on the HRCT features mentioned above, not their density changes most cases of chornic tympanitis can be diagnosed and differentiatied between cholesteatoma and granuloma by HRCT.

• 结论：根据中耳腔软组织影的形态及骨质破坏而非病变的密度改变，大多数慢性中耳炎患者可藉HRCT扫描准确诊断。