Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A linear opacity within the right lung base likely reflects focal subsegmental atelectasis . Otherwise , the lungs are clear without confluent consolidation . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are within normal limits . There is no pneumothorax . Healed left sided rib fractures are noted .
    OUTPUT:
    
Subsegmental atelectasis in the right lung base . No pneumonia or pleural effusion .