|   | 
       Image 1-Most of the tumor is composed of this cellular and vascular proliferation.   
         
          
        Image 2  
         
                
        Image 3-In one portion of the tumor, a highly cellular nodule is noted, merging with the earlier described areas.  
         
                 Image 4-Higher power magnification reveals considerable pleomorphism. 
         
                 Image 5-At least 5 mitotic figures per 50 high power fields are identified.  
        
        Image 6 
       
      What is your diagnosis?         | 
     
    
  | 
      | 
      | 
    Case Study  
        
      This is a 65 year old man who presents with a 3 cm nodule on the left elbow. 
            
        |