Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the chest radiograph obtained 1 day prior , there is substantial improvement in aeration throughout the left lung . Subtotal collapse has resolved with minimal residual atelectasis of the apex and lung base . Right lung is fully expanded and clear . No obvious consolidations . Moderate cardiomegaly is unchanged . Pleural effusions small , if any .
    OUTPUT:
    
Substantially increased left lung aeration with minimal residual atelectasis of the left apex and left lung base .