Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two PA and one lateral view of the chest . The lungs are essentially clear noting linear opacity at the left lung base which mostly clears on repeat exam and is most likely atelectasis . The cardiomediastinal silhouette is within normal limits . Osseous structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .