Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . A fracture of the posterolateral right fourth rib is again seen , better assessed on recent prior CT . No evidence of pneumothorax is seen . There may be a trace right pleural effusion . Mild bibasilar atelectasis is seen . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Right fourth rib fracture . Possible small right pleural effusion . Bibasilar atelectasis .