Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . There is mild unfolding of the thoracic aorta . There is no definite pleural effusion or pneumothorax . The chest is difficult to evaluate due to soft tissue attenuation , but there is no definite parenchymal abnormality . Although there is increased attenuation vaguely projecting over the mid - to - lower spine on the lateral view , this is felt most likely to be an artifact .
    OUTPUT:
    
Limited examination , but no definite evidence of acute disease .