Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the most recent prior examination , there is persistent moderate cardiomegaly with increasing , now moderate to severe interstitial pulmonary edema . There is a probable small left pleural effusion . Within the left lower lobe , there is a linear airspace opacity extending from the left hilum which likely represents atelectasis . No pneumothorax . Mediastinal contours are otherwise unchanged from prior examination .
    OUTPUT:
    
1 . Moderate cardiomegaly with increasing interstitial pulmonary edema , now moderate - severe . 2 . Linear , left lower lobe airspace opacity likely represents atelectasis .