Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 23 :08 is submitted .
    OUTPUT:
    
The left - sided pacer remains in place . Patient is status post median sternotomy with stable cardiac and mediastinal contours . Overall , interval improvement but persistent mild to moderate pulmonary and interstitial edema . No pneumothorax . No large effusions .