Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD device is noted with single lead terminating in the right ventricle . Patient is status post median sternotomy and CABG . The heart remains moderately enlarged , but unchanged . There are diffuse interstitial markings , slightly worse when compared to the prior exam , likely representing mild interstitial pulmonary edema superimposed on a background of known chronic interstitial lung disease . No pleural effusion or pneumothorax is present . There is no focal consolidation . No acute osseous abnormality is visualized .
    OUTPUT:
    
Mild interstitial pulmonary edema superimposed on a background of chronic interstitial lung disease .