Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates in the lower superior vena cava . The lung volumes are low . The cardiac , mediastinal and hilar contours appear unchanged . There is similar flattening of the left hemidiaphragmatic contour with a suspected pleural effusion , including mild relative elevation of the left hemidiaphragm , though less striking than on the prior examination . There is no pneumothorax . Compared to the prior study , aeration is much better bilaterally and the lungs are essentially clear .
    OUTPUT:
    
No evidence of acute disease .