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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.
â¢ Mosaic Attenuation = regional differences in attenuation = regions of different attenuation (opaque and lucent regions) on CT & distribution is often patchy, hence called mosaic = heterogeneous lung attenuation with well defined borders corresponding to the secondary pulmonary lobules.