Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP view of the chest demonstrates the lungs are well - expanded and clear . There is no evidence of pneumothorax . No evidence of free air is seen under the diaphragm . The heart size is normal . There is no evidence of pleural effusion , pulmonary edema or focal opacity within the lungs .
    OUTPUT:
    
No acute cardiopulmonary process .