Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided Port - A - Cath is stable in position , terminating in the low SVC / cavoatrial junction . Patient is status post median sternotomy and cardiac valve replacement . Right vascular stent is re - demonstrated . There is persistent blunting of the bilateral costophrenic angles , to lesser extent as compared to the prior study . Left base atelectasis / scarring is seen , consolidation due to pneumonia is less likely . No pneumothorax is seen . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Interval improvement in bilateral mid to lower lung opacities with blunting of the bilateral costophrenic angles persisting . Decreased left base patchy opacity , , most likely representing atelectasis / scarring , however , underlying consolidation due to pneumonia is not excluded in the appropriate clinical setting .