Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are within normal limits . The trachea is central , widening of the superior mediastinum is likely vascular and is unchanged compared to the prior study . No consolidation , pneumothorax or pleural effusion seen . Borderline cardiomegaly is likely due to the projection .
    OUTPUT:
    
No acute cardiopulmonary process seen .