Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 09 :27 is submitted .
    OUTPUT:
    
Patient is status post median sternotomy for CABG with stably enlarged cardiac mediastinal contours . Overall , there has been interval improvement but there is a residual bilateral interstitial and airspace process suggesting at least there is a component of resolving interstitial and pulmonary edema . More focal consolidation in the retrocardiac region persists and may represent partial lower lobe atelectasis although pneumonia or aspiration can not be excluded . Layering left effusion . No pneumothorax .