Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval improvement of aeration throughout both lungs since the initial appearence of diffuse ground glass nodular opacities . Lung volumes are low . The lungs are clear with no focal consolidation , effusion , or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
Improved aeration of the lungs .