Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged with slight tortuosity of the thoracic aorta again demonstrated . Pulmonary vasculature is normal . Linear opacities in the left lung base are compatible with subsegmental atelectasis or scarring . No focal consolidation , pleural effusion or pneumothorax is present . Moderate multilevel degenerative changes are noted in the thoracic spine . The patient is status post bilateral mastectomies with a left breast prosthesis .
    OUTPUT:
    
No acute cardiopulmonary abnormality .