Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chin flexion obscures each medial lung apex . Lung volumes are low . Within the limitations of technique , the cardiac , mediastinal and hilar contours are probably within normal limits . There is no pleural effusion or pneumothorax . The visualized lung fields appear clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .