Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is essentially clear . A moderate loculated left pleural effusion is again noted with left retrocardiac opacity , likely representing atelectasis , similar to the prior study . There is no right pleural effusion . There is no pneumothorax . Hilar prominence is consistent with pulmonary vascular congestion . Cardiomediastinal contours are stable . Pacemaker device is present with leads terminating in unchanged positions . Median sternotomy wires are noted .
    OUTPUT:
    
1 . Essentially unchanged appearance of the left hemi thorax with moderate loculated effusion and probable compressive lower lobe atelectasis . 2 . Mild vascular congestion .