Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is mild scarring at each lung apex , not significantly changed . There are no pleural effusions . In the setting of prior pleural effusion and atelectasis at the left lung base , patchy residual opacities are most likely due to chronic residual scarring . Elsewhere the lungs appear clear . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .