Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged including mild cardiomegaly . The lungs appear clear within the limitations of technique . There is no pleural effusion or pneumothorax . Lucency in the upper lungs is consistent with fairly severe emphysema . Lucencies overlying the left chest suggest soft tissue contours
    OUTPUT:
    
Emphysema . No evidence of acute disease .