Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Both lungs are remarkable for persisting mild interstitial pulmonary edema . The retrocardiac density has worsened reflecting an increased atelectasis in the left lower lung . Mild atelectasis in the right lower medial lung has also minimally worsened . Pleural effusion if any is minimal on the right side and stable . Heart size is mildly enlarged and unchanged . Mediastinal and hilar contours are stable in appearance .
    OUTPUT:
    
Persisting mild pulmonary edema and increased bilateral lower lung atelectasis .