Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright AP view of the chest demonstrates the lungs are well expanded and clear . The cardiomediastinal silhouette is unremarkable . There is no pneumothorax , pleural effusion , pulmonary edema , or focal airspace consolidation . No subdiaphragmatic free air is detected .
    OUTPUT:
    
No acute cardiopulmonary process .