Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The lung volumes are low resulting in slight vascular crowding . There is no pleural effusion or pneumothorax . No focal airspace consolidation to suggest pneumonia . The heart size is top normal but unchanged . The mediastinal contours are unremarkable . A metallic common bile duct stent is noted .
    OUTPUT:
    
No acute cardiopulmonary process .