Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Linear opacity seen in the right mid lung in the retrocardiac region similar to prior suggestive of atelectasis versus scarring . Elsewhere , the lungs are clear without consolidation or pulmonary vascular congestion . Cardiac silhouette is enlarged but stable in configuration . No acute osseous abnormality is identified . Atherosclerotic calcification is seen at the aortic arch . Hypertrophic changes noted in the spine .
    OUTPUT:
    
No acute cardiopulmonary process .