Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes and lordotic view accentuate bronchovascular markings . The mediastinal contours are unchanged with smooth borders . The hila are unremarkable . Heart size is top normal . The lungs are clear . No pleural effusions or pneumothorax .
    OUTPUT:
    
No substantial change , widened mediastinum is likely related to body habitus and vascular structures .