Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new linear opacity within the medial right lung base projecting over the spine on the lateral view , likely reflects subsegmental atelectasis . No confluent consolidation is identified . There is no pulmonary edema or pleural effusion . Cardiomediastinal and hilar contours appear within normal limits . There is no pneumothorax .
    OUTPUT:
    
Right basilar subsegmental atelectasis