Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is within normal limits . A left central venous line terminates in the mid SVC . The lung fields are clear . The visualized upper abdomen appears within normal limits . There is no free air below the diaphragm . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No evidence of pneumonia .