Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates in the superior vena cava . The cardiac , mediastinal and hilar contours appear unchanged . The lungs appear clear . A trace pleural effusion is again noted , as seen on the prior CT and perhaps a little larger .
    OUTPUT:
    
Very small left - sided pleural effusion , but no evidence of pneumonia or congestive heart failure .