Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The degree of previously seen moderate interstitial pulmonary edema has substantially improved , with mild residual edema . There is minimal bilateral lower lung atelectasis . There is no focal consolidation . The heart size is mildly enlarged , as before . The mediastinal contours are normal . A small left pleural effusion is not significantly changed . There is no right pleural effusion . No pneumothorax is seen . The patient is status post midline sternotomy and CABG .
    OUTPUT:
    
1 . Marked interval improvement in the degree of pulmonary edema , which is now minimal . 2 . Small left pleural effusion , not significantly changed . 3 . Unchanged mild cardiomegaly .