Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright view of the chest . The lungs are clear of focal consolidation or large pleural effusion . Linear opacities in the left lower lung most suggestive of atelectasis . The cardiomediastinal silhouette is within normal limits . Osseous structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .