Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . There is mild linear density in the left lung base which likely represents a small amount of atelectasis . Aside from this , lungs are well expanded . No pleural effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Minimal linear atelectasis at the left lung base . Otherwise , normal .