Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 14 : 50 is submitted .
    OUTPUT:
    
Status post median sternotomy with heart being upper limits of normal in size given portable technique . The aorta is somewhat unfolded . Pulmonary arteries are slightly prominent raising the possibility of pulmonary arterial hypertension . Patchy opacity at the right lung base most likely reflects atelectasis given the clear lung bases on the CT performed ___ , although aspiration should also be considered . Followup imaging may be helpful . No pulmonary edema or pneumothorax .