Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Left IJ central venous catheter terminates in the upper SVC . Ill - defined opacity at the right lung base may represent atelectasis , infection , or aspiration . Lungs are otherwise clear . Heart size and cardiomediastinal contours are stable .
    OUTPUT:
    
Left IJ central venous catheter terminates in the upper SVC . Ill - defined right lung base opacity may represent atelectasis or infection .