What is the most likely diagnosis? 
              
- 27 year-old male with pain in the foot
 

  
  Conventional Radiograph of Foot
            
              - Gout
 
              - Reactive arthritis 
 
              - Stress fracture 
 
              - Enchondroma 
 
              - Hallux valgus
 
            
            Additional Images - Close-up image of foot
            
             
            
               
              Additional Images
               
              
              Close-up image of foot
              
             
            
              
                  Answer:
               
              
                4. Enchondroma (with pathologic fracture)
                 
              
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              Enchondroma with Pathologic Fracture
                
              
              General Considerations 
              
                - Benign cartilaginous tumor
 
                - Develops in the medullary cavity
 
                - Usually solitary, although they can        occur as multiple lesions in syndromes to be discussed
 
                - Arise from ectopic rests of hyaline        cartilage
 
                - Occur mostly in 2nd to 3rd decade