Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall , appearances are very similar when compared to the prior study . Lung volumes remain low with a moderate left pleural effusion and left basal airspace opacity . This is likely due to atelectasis but infection can not be excluded . The right lung appears grossly clear . A right chest wall pacemaker is unchanged in appearance . Leads from a previously removed pacemaker also seen . No pneumothorax seen . Mild prominence of the bilateral hila and pulmonary vasculature is similar in degree when compared to the prior study and consistent with a degree of congestive heart failure . Moderate cardiomegaly .
    OUTPUT:
    
No significant interval change when compared to the prior study .