Surface Osteosarcoma

  • Etiology: malignant bone forming tumor
  • Parosteal osteosarcoma
    Imaging: attached to underlying cortex, most common in posterior distal femur
    Clinical: older 20-50 years old, low grade
  • Periosteal osteosarcoma
    Imaging: cortical thickening, no medullary involvement, most common location diaphyseal
    Clinical: 15-25 year old, intermediate grade, 5% of osteosarcoma

Cases of Surface Osteosarcoma

Radiograph of parosteal osteosarcoma of the femur
AP and lateral radiographs of the left hip shows a poorly circumscribed, sclerotic, expansile lesion that appears to be attached to the cortex.