What is the most likely diagnosis? 
              
                - 11 year-old male who struck left knee

                
                Lateral Radiographs of both Right and Left Knees
              
                - Osteosarcoma
- Osgood-Schlatter Disease
- Cortical Desmoid
- Dislocated Patella
- Spokewheel Fracture
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                  Answer:
               
              
                3. Cortical Desmoid
                 
              
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              Cortical Desmoid
                
              
              General Considerations
              
                - AKA  Distal Femoral Metaphyseal Irregularity, Avulsive Cortical Irregularity,  Periosteal Desmoid
- Age  range: 3-17 years, most common 10-15
                - Cortical       irregularity at the posterior, medial and distal femur deep to the attachments       of medial gastrocnemius or distal adductor magnus