Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lungs appear relatively clear without focal consolidation , large effusion or pneumothorax . There may be minimal atelectasis the left lung base . No signs of congestion or edema . Cardiomediastinal silhouette appears normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild left basal atelectasis . No convincing evidence for pneumonia .