Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dialysis catheter terminates in the upper atrium as before . The heart is again moderately enlarged . The mediastinal and hilar contours appear unchanged . There is again perihilar fullness and hazy central pulmonary vascularity which suggests mild vascular congestion that appears unchanged . Mild relative elevation of the right hemidiaphragm compared to the left is similar . There is no definite pleural effusion or pneumothorax . Mild degenerative changes are noted along the thoracic spine .
    OUTPUT:
    
Findings suggestive of mild background fluid overload with perhaps a slight increase .