What is the most likely diagnosis? 
              
- 27 year-old with chest pain

                
                Frontal Radiograph of Chest and
                Axial CT Image of the Thorax
              
                - Pneumothorax
- Swyer-James Syndrome
- Obstructive Emphysema
- Pulmonary Embolism
- Poland's Syndrome
Additional Images-Axial CT Image of the Thorax
              
             
            
               
              Additional Images
              
      
                  
              Axial CT Image of the Thorax
              
             
            
              
                  Answer:
               
              
                5. Poland's Syndrome
                 
              
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              Poland's Syndrome
                  
              
              General Considerations
              
                - Uncommon  congenital anomaly characterized by unilateral anomalies of the chest wall and  upper extremity
- Males  are more affected than females and the right side is involved more often than  left
- Most  likely secondary to a vascular developmental anomaly during the 6th week of  gestation