Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dialysis catheter terminates in the right atrium , as before . The cardiac , mediastinal and hilar contours appear unchanged . There is no overt evidence for fluid overload . There may be perhaps a vague opacity in the right lower lung that appears similar and may represent minimal chronic scarring or atelectasis . There are no pleural effusions or pneumothorax . Degenerative changes including fragmentation of the humeral head on the right appears similar .
    OUTPUT:
    
No evidence of congestive heart failure .