Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A linear opacity within the right lung base may reflect a focus of subsegmental atelectasis . No confluent opacity is identified to suggest pneumonia . There is no pulmonary edema or pleural effusions . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits and unchanged from prior .
    OUTPUT:
    
Apparent right lower lobe subsegmental atelectasis . No evidence of pneumonia .