Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . A large hiatal hernia causes apparent widening of the mediastinum . In addition , there appears to be a new retrocardiac opacity . There is no definite consolidation , effusion , or pneumothorax . New right - sided internal jugular line tip terminates at the mid SVC . Sternotomy wires and retained internal pacing leads are in stable positions . Aortic arch atherosclerosis and tortuosity are unchanged .
    OUTPUT:
    
Low lung volumes and large hiatal hernia . New retrocardiac opacity , potentially atelectasis , infection is also possible . Repeat with PA and lateral views may help further characterize if patient is amenable .