Abnormal pulmonary thoracic imaging finding Mosaic attenuation pattern in lung 2024-02-11T10:50:49Z Mosaic attenuation pattern in the lung is a term used to describe regions of differing pulmonary attenuation on CT imaging. It is a non-specific finding, although is associated with several conditions such as obstructive small airway disease, occlusive vascular disease (in which case is called mosaic perfusion pattern), pulmonary edema, and parenchymal diseases.