Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is enlarged . The mediastinal silhouette is tortuous , unchanged . The hilar contours and pleural surfaces are normal . No pleural effusions or pneumothorax is present .
    OUTPUT:
    
No acute intrathoracic process . These findings were communicated via telephone to ___ ___ , M .D . , at 4 :30 p .m . on ___ .