Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . A moderate right pleural effusion is essentially unchanged from the previous examination with accompanying compressive atelectasis . The lungs are otherwise clear aside from mild vascular congestion . There is no left pleural effusion . The heart is mildly enlarged with otherwise normal cardiomediastinal contours .
    OUTPUT:
    
Unchanged moderate right pleural effusion .