Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to chest radiographs obtained 3 days prior , there are persistent low lung volumes with retrocardiac atelectasis , left pleural thickening , and a moderate left pleural effusion . Cardiomegaly is stable . A right - sided IJ central venous catheter , a left - sided port , and pacemaker leads are unchanged in location . There is no evidence of pulmonary edema or pneumothorax .
    OUTPUT:
    
Unchanged left lower lobe atelectasis with a moderate left pleural effusion .