Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is slight elevation of the right hemidiaphragm which is unchanged . Vague linear density at the left lung base is most compatible with atelectasis or scarring . There is no definite sign of pneumonia or CHF . No pleural effusion or pneumothorax . The heart size is grossly stable . Mediastinal contour is unremarkable . The bony structures are intact .
    OUTPUT:
    
No definite signs of pneumonia .