Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal contours are unchanged . Minimal ill - defined opacity in the right lung base is similar when compared to the prior study , and likely reflective of mild atelectasis and overlapping vascular structures . No focal consolidation , pleural effusion or pneumothorax is definitively noted . There are no acute osseous abnormalities .
    OUTPUT:
    
No radiographic evidence for pneumonia . Minimal patchy opacity in the right lung base , likely reflective of atelectasis and unchanged when compared to the prior exam .