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Great Vessels
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18 weeks a    
  Pulmonary artery and ductus arteriosus    
22 weeks c d  
  Pulmonary artery and ductus arteriosus    
26 weeks c    
  Aorta (arrow)    
31 weeks c    
  Aorta    
32 weeks c d  
  Superior Vena Cava and Inferior Vena Cava Aorta (arrow)  
34 weeks c    
  Aorta (note subclavian and common carotid arteries ascending to the head)