Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes are low though lungs appear clear . The heart is top - normal in size though stable . Mediastinal contour is unchanged . There may be mild hilar congestion without frank edema . No effusion or pneumothorax . Bony structures appear intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild hilar congestion and top - normal heart size .