Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal , slightly increased since the prior study , likely due slightly lower lung volumes and patient rotation . The lungs are clear aside from a small amount of left basilar atelectasis . Apparent right lower lobe nodular opacities are most likely due to vessels on end . No pleural effusion or pneumothorax ; minimal left posterior pleural scarring is chronic . Hilar contours are within normal limits .
    OUTPUT:
    
No evidence of pneumonia .