Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . The cardiac silhouette is unremarkable . The mediastinum is slightly widened above the aortic knob , with an equal right and left distribution and no displacement of the trachea , most consistent with fat deposition .
    OUTPUT:
    
No acute cardiopulmonary process .