Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are again seen . A left pleural effusion is slightly increased from prior , now moderate in size with associated compressive atelectasis in the left lower lung . The previously noted right pleural effusion has resolved . The heart size can not be assessed . Mediastinal contour is normal . The bony structures are intact .
    OUTPUT:
    
Slight increase in left pleural effusion , now moderate in size .