Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided dialysis catheter terminates in the right atrium . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Subtle airspace opacities are demonstrated throughout both lungs ( right greater than left ) , predominantly at the bases which could represent atypical infection or mild pulmonary edema . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Subtle airspace opacities throughout both lungs , predominantly at the bases , which are increased from ___ and could represent atypical infection or mild pulmonary edema .