Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - lumen dialysis catheter is noted with tip terminating in the SVC . Mild enlargement of the cardiac silhouette is stable . The mediastinal and hilar contours are unchanged . Pulmonary vascularity is not engorged . Focal ill - defined opacity in the left lung base may reflect an area of infection and appears more pronounced in the interval . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Focal ill - defined opacity in left lung base may reflect an area of infection , and appears slightly progressed in the interval .