Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 08 :32 is submitted .
    OUTPUT:
    
Single lead left - sided pacer remains in place . Heart remains stably enlarged status post median sternotomy for CABG . There is stable mild perihilar vascular congestion but no overt pulmonary or interstitial edema . There is subtle faint opacity in the right medial apex which is felt to represent distended vascular structures . No focal airspace consolidation is seen to suggest pneumonia . No pneumothorax .