Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Midline sternotomy wires are unchanged . The cardiomediastinal and hilar contours are normal . There continues to be a small - to - moderate pleural effusion on the right with underlying atelectasis . This effusion contains a few locules of air , similar to prior exam . This is confirmed by chest CT from the same day .
    OUTPUT:
    
Stable appearance of right hydropneumothorax with associated atelectasis .