Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increasing moderate left - sided pleural effusion . There is also loculated pleural fluid superiorly . Improved aeration of the left lower lobe with persistent mild subsegmental atelectasis . The right lung is relatively clear . Moderate cardiomegaly with tunneled dialysis catheter in the right atrium and dual lead pacer with the tips in the right atrium and right ventricle .
    OUTPUT:
    
Increasing moderate left pleural effusion . Improved aeration of the left lower lobe .