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Musculoskeletal » Lower Extremity
Osteosarcoma of the femur
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Author(s) :
Ravi Kadasne, MD
Presentation An adult male presents with a palpable mass in the anterior lower thigh.  Ultrasound was performed to characterize the mass.
Caption: Scan of the femur at the site of swelling
Description: A 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. 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: Transverse view of the soft tissue mass
Description: The hypoechoic soft tissue mass is seen here. The bony spicules within the mass exhibit dense posterior shadowing.
Caption: Sagittal scan of the lower end of the femur
Description: The sun-ray appearance is appreciated again in this image. Multiple defects in the cortex of the femoral bone are also seen here.
Caption: Sagittal scan of the lower end of the femur
Description: There is an area of cortical break shown in this image. The arrow points to a portion of the periosteum that is elevated. The soft tissue mass is also seen.
Differential Diagnosis Osteosarcoma, Ewing's sarcoma
Final Diagnosis Osteosarcoma of the femur