Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Within the limitations of technique , the cardiac , mediastinal , and hilar contours appear probably unchanged . Blunting of the left costophrenic angle is similar and accordingly is probably due to scarring in the costophrenic sulcus rather than a pleural effusion . There is no convincing evidence for a substantial pleural effusion on either side . There is no pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .