Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is subtle opacification at the right medial base , which may represent overlapping vessels , however a pneumonia can not be excluded . The lungs are otherwise clear . The pulmonary vascular is normal . The heart is not enlarged . There are no pleural effusions . There is no pneumothorax .
    OUTPUT:
    
Subtle opacification at the right medial base , which may represent overlapping vessels , however a pneumonia can not be excluded .