Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities at the lateral aspect of the left lung are likely atelectasis versus scarring given chronicity . The lungs are otherwise clear without consolidation , effusion , or edema . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications noted in the aorta . Degenerative changes noted in the spine as well as a right shoulder arthroplasty .
    OUTPUT:
    
No acute cardiopulmonary process .