Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral low lung volumes . Interval improvement retrocardiac opacity , likely atelectasis , and stable mild right lower lobe atelectasis . Stable mild bilateral pulmonary vascular congestion . Cardiomediastinal silhouette is unchanged . Again seen is the median sternotomy wires in metal mediastinal clips . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Interval improvement in left base atelectasis with stable mild right base atelectasis . Stable mild bilateral pulmonary vascular congestion