Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating cardiomegaly which is overall stable from ___ . On lateral view , an opacity overlying the spine may represent atelectasis or pneumonia in the right clinical setting . Mediastinal contours and hila are normal . There is no pneumothorax or pleural effusion . Elevation of the left hemidiaphragm is stable from ___ .
    OUTPUT:
    
Opacity overlying the spine may represent atelectasis or pneumonia in the right clinical setting . If concern for dissection , chest CTA should be obtained .