الفهرس 
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Abstract
The term mosaic attenuation or pattern refers to a patchwork of regions of differing attenuation detected on HRCT images, and may represent obliterative small airways disease, patchy interstitial disease, or occlusive vascular disease. This mosaic pattern of lung attenuation presents a challenge to the radiologist when deciding which are the abnormal regions of lung, those of low attenuation, those of high attenuation, or both and what is the possible aetiology .
Diseases from each of these categories can cause similar patterns of mosaic lung attenuation on CT scans. However, it is sometimes possible to distinguish among these categories by using additional CT findings.