Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is mild cardiomegaly The lung volumes are low with mild secondary widening of the cardiomediastinal silhouette . There is no pleural effusion and no pneumothorax . There is no pneumonia or pulmonary edema . The fourth right rib is missing .
    OUTPUT:
    
No acute cardiothoracic process .