Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with mild unfolding of the thoracic aorta . The mediastinal and hilar contours are unremarkable . Indistinct , primarily peribronchovascular opacity at the right lung base is re - demonstrated , but with slightly changed morphology . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Indistinct , primarily peribronchovascular opacity of the right lung base raises concern for aspiration or pneumonia .