Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single AP supine chest radiograph was obtained . The lungs are well expanded and clear . There is no focal consolidation , effusion , or pneumothorax . Large apical blebs are visualized at the lung apices . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Apical emphysema . No acute cardiopulmonary process .