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We have observed three categories of disease known to cause a CT mosaic pattern of lung attenuation: small-airway disease, vascular lung disease, and infiltrative disease. Diseases from each of these categories can cause similar patterns of mosaic lung attenuation on CT scans.
The mosaic pattern of lung attenuation refers to a patchwork of regions of differing attenuation. The term is descriptive and nonspecific.It can be seen with: 1  Small-airways disease (shown above) : Air trapping and bronchial dilatation commonly seen. Mosaic attenuation pattern on thin-section CT scans of the lung: differentiation among infiltrative lung, airway, and vascular diseases as a cause.