Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided pacemaker device is re - demonstrated with leads terminating in right atrium and right ventricle . The patient is status post median sternotomy and CABG . The heart size remains mildly enlarged . The mediastinal and hilar contours are unchanged . Mild interstitial pulmonary edema appears improved compared to the previous exam . No focal consolidation , pleural effusion or pneumothorax is demonstrated . The patient is status post left mastectomy . Left apical scarring is again noted . There are several clips projecting within the right axillary region .
    OUTPUT:
    
Mild interstitial pulmonary edema , improved compared to the previous exam .