Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest film ___ at 14 :35 is submitted .
    OUTPUT:
    
Left - sided pacer device remains in place . Patient is status post median sternotomy with stable postoperative cardiac and mediastinal contours . Bilateral interstitial opacities are likely not significantly changed given lower lung volumes and likely reflect mild to moderate interstitial edema . No large effusions . No pneumothorax .