Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low but slightly improved on the left with improved aeration of the left lung base . A left - sided chest tube is in - situ , unchanged in appearance . No pneumothorax seen . There is minimal airspace opacity in the left lower lobe which may reflect re-expansion pulmonary edema , there is likely a small residual pleural effusion . There is some residual left basilar atelectasis . The right lung appears grossly clear . The cardiomediastinal contour is unchanged compared to the prior study .
    OUTPUT:
    
No significant interval change when compared to the prior study except to note slight improvement in the degree of aeration of the left lung base .