Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are normal . Mild cardiomegaly . Mild pulmonary vascular congestion . There is a tubular lucency extending from the right hilum an abruptly terminating at the level of the clavicle which likely represents a dilated brachiocephalic vein . There is mild tortuosity of thoracic aorta . The pleural surfaces are normal .
    OUTPUT:
    
No acute cardiopulmonary process .