马赛克衰减型（mosaic atteuation pattern）(图文)

CT 表现： 该型表现为拼凑在一起的不同衰减区，可能代表斑片状间质性病变、闭塞性小气道病
变或闭塞性血管病变。该术语较原先的术语—— 马赛克血量减少和灌注（mosaic oligemia and perfusion）包含更广泛。继发于支气管和细支气管阻塞的空气潴留可产生局部低衰减带， 后者应用呼气相CT 可增强其表现。马赛克衰减型也可发生在以磨玻璃影为特征的间质性肺病中。此时，较高衰减区代表间质病变，而较低衰减区代表正常肺。

CT scans.—This pattern appears as patchwork of regions of differing attenuation that may represent (a) patchy interstitial disease, (b) obliterative small-airways disease (Fig 1), or (c) occlusive vascular disease . Mosaic attenuation pattern is a more inclusive term than the original terms mosaic oligemia and perfusion . Air trapping secondary to bronchial or bronchiolar obstruction may produce focal zones of decreased attenuation, an appearance that can be enhanced by using expiratory CT . The mosaic attenuation pattern can also be produced by interstitial lung disease characterized by ground-glass opacity; in this situation, areas of higher attenuation represent the interstitial process and areas of lower attenuation represent the normal lung.

Figure 1: Transverse CT scan shows mosaic attenuation pattern caused by obliterative small-airways disease.

(本文编译参考自Fleischner Society: Glossary of Terms for Thoracic Imaging -- Hansell et al. Radiology 2008;246:697-722.仅供学习交流之用,转载请注明源于影像园http://www./)

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