Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . A tiny partially loculated left pleural effusion is unchanged . There is a stable small right pleural effusion . The heart and mediastinum are within normal limits . The lungs are clear . Multilevel spinal degenerative changes are stable .
    OUTPUT:
    
Unchanged small bilateral pleural effusions , right greater than left . Clear lungs .