Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . No prior . Lungs are essentially clear , noting mild bibasilar left greater than right subsegmental atelectasis . The cardiomediastinal silhouette is within normal limits . Hypertrophic changes are seen in the spine .
    OUTPUT:
    
Bibasilar atelectasis . Otherwise , no acute cardiopulmonary process .