Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent small bilateral effusions are seen , left greater than right not dramatically changed since last week 's exam . Opacity in the retrocardiac region is likely due to atelectasis , similar to prior . The lungs are otherwise grossly clear noting that the right lung apex is not assessed due to patient 's overlying hair . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Persistent left - greater - than - right pleural effusions , not dramatically changed .