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          Patient with cyanosis. Lung perfusion scan.
              
    
    

          
    
          
  
  
  
      
          
            
          
  
      
  
  
          
    
          2011
            
          

  
  
          
  
          

    
    
    
          
  Teaching Case    
    
    
  
          
  
          

    
    
    
          
    
    
    
  
          
  
          

    
    
    
          
  
          Case presentation:
          

            

          • Male.
            • 

          • 3 months old.
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          • Admiitted because of cyanosis and hypoxemia, unmodified after oxygen therapy.
            • 

          • Chest X-ray showed an opacity in the left upper field.
            • 

          

          Teaching points:
          

            

          • Pulmonary arterovenous fistulae may be multiple, and they may open at diferent ages.
            • 

          • Perfusion lung scan allows a non-invasive, sensitive and reproducible quantification of right-to left-shunts, that correlates with hypoxemia.
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