Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there has been interval development of a heterogeneous opacity at the right lung base , which may reflect aspiration or pneumonia . The cardiomediastinal and hilar contours are normal . There is no pneumothorax or large pleural effusion . Incidental note is again made of an azygos fissure .
    OUTPUT:
    
New right base opacity , consistent with aspiration or pneumonia in the correct clinical setting .