Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Flattening of the diaphragm likely represents hyperinflation of the lungs . New retrocardiac opacities are likely due to atelectasis . The heart size is unchanged . No pneumothorax or pulmonary edema .
    OUTPUT:
    
1 . Hyperinflated lungs , usually due to COPD or small airways obstruction . 2 . Otherwise , no acute cardiopulmonary process .