Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were provided . There is mild basilar atelectasis without definite signs of pneumonia or CHF . Heart size is top normal . The mediastinal contour appears normal . There is no pneumothorax and no definite sign of pleural effusion . Bony structures are demineralized .
    OUTPUT:
    
No definite signs of pneumonia .