Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited due to patient position . The lungs are clear of focal consolidation , pleural effusion or pneumothorax . The heart is normal in size . The upper mediastinum is wide with enlargement of the aortic knob also noted . There is no pulmonary edema .
    OUTPUT:
    
Widened upper mediastinum and enlarged appearance of the aortic knob . Recommend repeat upright chest radiographs .