Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or edema . Linear opacity in the left lower lung is likely atelectasis . Cardiomediastinal silhouette is stable and there is tortuosity of the descending thoracic aorta with atherosclerotic calcifications at the arch . Degenerative changes are noted at the left shoulder and there is a chronic left fourth rib fracture posteriorly . Postoperative changes of bilateral mastectomies with left breast prosthesis are noted .
    OUTPUT:
    
No acute cardiopulmonary process .