Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a vague opacity at the left lung base that most likely represents atelectasis . Otherwise , no focal consolidation , pleural effusion or pneumothorax . Biapical scarring is stable . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified . Pacer device is unchanged in position , with leads terminating in the right atrium and right ventricle , expected . Median sternotomy wires are intact .
    OUTPUT:
    
No acute cardiopulmonary process .