Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph obtained . Lung volumes are somewhat low though the lungs appear clear without signs of pneumonia or CHF . The heart is partially assessed only due to low lung volumes though appears grossly unremarkable . A tiny stent projecting over the left heart border may represent a coronary stent . Mediastinal contour is normal . Bony structures intact .
    OUTPUT:
    
No acute findings .