中下鼓室内结节的影像学研究

Imaging study of nodules in the tympanum

目的:探讨中、下部鼓室内结节的影像学诊断价值。方法:回顾性分析23例中、下鼓室内结节的影像学表现和影像鉴别诊断,23例病例均行横断面和冠状面高分辨力CT(HRCT)及MRI平扫和增强扫描。结果:23例病例在横断面和冠状面HRCT扫描中均能显示中、下鼓室内软组织结节,除4例血管变异CT能明确诊断外,其他病例HRCT均无特征性表现。23例行MRI平扫和增强扫描,其中19例中下鼓室结节显示为实质性占位,不同病例其MRI信号有差异;4例血管变异MRI显示血管的流空征,增强后显示变异的血管影。结论:横断面和冠状面HRCT可显示中下鼓室软组织结节,但对于软组织结节的性质CT难以明确诊断,MRI对中下鼓室结节性质的诊断优于CT。

Objective：To investigate the value of imaging diagnosis in mid-inferior tympanum nodules.Methods：Imaging findings as well as the differential diagnosis of the mid-inferior tympanum nodules in 23 cases were retrospectively studied,axial and coronal high resolution CT（HRCT）and MRI were performed in all of these 23 patients.Results：Mid-inferior tympanum soft tissue nodules could be showed in all of these 23 cases.Apart from four cases with vascular anomalies could be definitely diagnosed by HRCT,no characteristic HRCT manifestations could be assessed in the rest of lesions.Of the 23 cases with plain and enhanced MRI,solid space occupying lesions of mid-inferior tympanum were showed in 19 cases,the MRI signal intensities varied.Flow void sign was showed in 4 cases with vascular anomalies,vascular lesion was displayed after contrast enhancement.Conclusion：Soft tissue nodules within mid-inferior tympanum could be assessed on axial and coronal HRCT,but the nature of these nodules were difficult to be diagnosed by CT,MRI is superior to CT in the diagnosis of the nature of mid-inferior tympanium nodules.