Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for distortion by a pectus carinatum deformity , the cardiac , mediastinal and hilar contours appear stable and within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear . Bony structures appear within normal limits . There has been no significant change .
    OUTPUT:
    
No evidence of acute disease .