Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dialysis catheter terminates in the upper right atrium . The cardiac , mediastinal and hilar contours appear unchanged , allowing for small differences in technique . Streaky left basilar opacity suggests minor atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . There is no evidence for free air .
    OUTPUT:
    
No evidence of acute disease or free air .