Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is unremarkable and unchanged since the prior examination . The aortic arch is calcified . Again noted is minimal lingular atelectasis , unchanged since the prior examinations . No focal consolidation is identified . There is no pleural effusion . No definite pneumothorax is identified , though is not excluded either as a subtle abnormality is noted at the right apex . Multilevel degenerative changes are noted throughout the thoracic spine .
    OUTPUT:
    
Subtle linear abnormality of the right apex may represent a pneumothorax in the appropriate clinical context . No focal consolidation identified .