Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Vague linear density in the right lower lung is most compatible with atelectasis . No convincing signs of pneumonia or CHF . No large effusion or pneumothorax is present . The heart size is top - normal . Mediastinal contour is unremarkable . There is no free air below the right hemidiaphragm . Bony structures appear intact .
    OUTPUT:
    
Mild right basal atelectasis . Top - normal heart size .