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Musculoskeletal/Small parts » Musculoskeletal
Femoral osteosarcoma
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Author(s) :
Vikas Arora, MD
 
Presentation A 15-year-old boy presented with a swelling just above the right knee.
 
 
 
Caption: Scan of the femur at the site of swelling
Description: An irregular hypoechoic soft tissue mass is seen in close proximity to the lower end of the femur. There is evidence of cortical disruption at multiple places as marked by the arrows. Linear echogenic areas are seen within this soft tissue mass representing bony spicules. This produces the sunray appearance of the mass, which is highly suggestive of osteosarcoma.
 
 
 
Caption: Comparative transverse views of the lower ends of the femorae
Description: The hypoechoic soft tissue mass with bony spicules within is seen involving the distal end of the right femur. The normal left femur is shown for comparison. There is evidence of cortical disruption at multiple sites and the sunray appearance of the tumor is well appreciated here.
 
 
 
Caption: Comparative sagittal views of the lower ends of both femorae
Description: The tumor is seen involving the distal end of the right femur. The left femur is shown for comparison.
 
Differential Diagnosis Osteosarcoma of the femur, Ewing's sarcoma
 
Final Diagnosis Osteosarcoma of the femur
 
Follow Up The diagnosis was established histopathologically.
 
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