Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The left hilum shows a round structure in both views although possibly explained by vascular structures . The lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary disease . 2 . Findings which may imply left hilar lymphadenopathy . Particularly given the context of known malignancy , chest CT is suggested when clinically appropriate , preferably with intravenous contrast if feasible .