Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Lung volumes are low which crowd the vascular markings . There is likely some pulmonary vascular congestion . The mediastinum appears widened compared to prior studies , which could be in part due to low lung volumes and technique . No focal consolidations are seen . No pneumothorax or pleural effusions . The sternotomy wires are intact .
    OUTPUT:
    
Low lung volumes . The mediastinum appears widened compared to prior studies , which could be technical and due to low lung volume however but it also raises the possibility of acute aortic syndrome . CT of the chest with contrast can be done if there is clinical suspicion . These findings were discussed with Dr . ___ by Dr . ___ at 9 : 45 am on ___ at the time of discovery .