Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate unfolding of the thoracic aorta , this likely is the cause of apparent widening of the mediastinum . Lung volumes are within normal limits . No consolidation or pneumothorax seen . No pleural effusion seen . Surgical hardware in the lower cervical spine is incompletely visualized . Small sclerotic focus in the left proximal humerus likely reflects a bone island .
    OUTPUT:
    
No acute cardiopulmonary process seen . Apparent widening a mediastinum appears to be due to unfolding of the thoracic aorta , exaggerated by the AP technique . Recommend PA and lateral chest radiographs when the patient 's clinical condition improves .