Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 05 : 13 is submitted .
    OUTPUT:
    
Status post median sternotomy with stable cardiac and mediastinal contours . Interval appearance of mild perihilar and interstitial edema . No large effusions . No pneumothorax . Prominent pulmonary arteries are unchanged and may reflect underlying pulmonary arterial hypertension . Clinical correlation is advised .