Monday, December 10, 2012

Periosteal Versus Parosteal Osteosarcoma

Periosteal Osteosarcoma
  • femur, tibia
  • diaphyseal
  • chondroid neoplasm - has high water content
    • lower attenuation than muscle on CT
    • high signal intensity on T2WI
  • broad based soft tissue mass attached to cortex
  • cortical thickening and scalloping
  • periosteal reaction
  • marrow involvement is rare

Parosteal Osteosarcoma
  • femur - usually posterior distal aspect
  • metaphyseal
  • growth tends to be circumferential to bone's surface 
  • cleavage plane separates lesion from the cortex
  • dense osteoid matrix
  • usually has marrow involvement
  • low signal on T1WI and T2WI
    • higher grade lesions may be high signal on T2WI

Jelinek JS, Murphey MD, Kransdorf MJ, et al. Parosteal osteosarcoma: value of MR imaging and CT in the prediction of histologic grade. Radiology 1996;201:837-42.
Murphey MD, Jelinek JS, Temple HT, et al. Imaging of periosteal osteosarcoma: radiologic-pathologic correlates. Radiology 2004;233:129-38.

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