Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right subclavian central venous catheter terminates in the mid superior vena cava . The cardiac , mediastinal and hilar contours appear stable . There is no evidence for pleural effusion . Regarding the small pneumothorax , it has decreased and at most trace pleural air at the right lung apex . The lungs appear clear .
    OUTPUT:
    
Decreasing small right apical pneumothorax , hardly visible .