Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Top normal heart size noted not significantly changed . Hilar and mediastinal contours are normal . The lungs are clear without focal consolidation , effusion or pneumothorax . Minimal basal atelectasis is noted on the left side . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Top normal heart size , mild left basal atelectasis . Otherwise unremarkable .