Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral lung volumes are lower . Since yesterday , mild - to - moderately severe pulmonary edema has significantly improved . However , moderate right pleural effusion associated with right lower lung atelectasis and left lower lung atelectasis and small left pleural effusions are unchanged . The lung effusions and atelectasis obscuring the mediastinal border , thus assessment of the cardiomediastinum was limited .
    OUTPUT:
    
Over last 24 hours , mild pulmonary edema has significantly improved , moderate right and small left pleural effusion as well as bilateral lower lung atelectasis are unchanged .