Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate clear lungs bilaterally . The lungs are symmetrically expanded . Cardiomediastinal and hilar contours are within normal limits . There is no evidence of pulmonary edema , pneumothorax , or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process .