Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest demonstrates the lungs are well expanded and clear , with no focal pneumonia , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is unremarkable . There is no subdiaphragmatic free air .
    OUTPUT:
    
No acute cardiopulmonary process . No evidence of subdiaphragmatic free air .