HISTORY:
                    This is a male in his 40s who developed progressive shortness of breath.  He has a right chest mass has been enlarging in the last few months.  AFP is elevated.  His history is significant for a testicular mass that was not treated.  A fine needle aspiration biopsy of the chest mass was performed.
                 
						
                         
			            
			            
                        
                        
                        
                        
                             
                
                    
                 
                           This mass is most likely to be?
                     
                             
                                - Adenocarcinoma
 
                                - Squamous cell carcinoma
 
                                - Metastatic Yolk sac tumor
 
                                - Metastatic embryonal carcinoma
 
                            
                            
                         
                        
                         
                            
                           Metastatic Yolk sac tumor