Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright and lateral views of the chest were reviewed and compared to the prior study . Mild vascular congestion has improved . The previously described rounded opacity in the left lower lung is not visualized on this study ; however , as mentioned on the prior study , opacities in the lingula and left lower lobe seen on abdominal CT performed two year prior need chest CT to document stability . The previously described left lower lobe linear opacity is relatively unchanged and most likely represents atelectasis . A right sided dialysis catheter is unchanged in position . Median sternotomy wires and surgical clips overlying the mediastinum and heart are consistent with prior CABG . Cardiac and mediastinal silhouettes are stable . There is no pneumothorax or pleural effusion . Linear opacities overlying the left hemithorax correspond to skin folds .
    OUTPUT:
    
1 . Left lower lobe opacity most likely represents atelectasis . 2 . Improved mild vascular congestion .