Right knee pain and swelling
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A large lobulated mass arises from the posterior aspect of distal femur above the lateral femoral condyle and partially encircling around the femur. It displays low signal in all pulse sequence denoting ossified matrix. Soft tissue edema around the lesion. No cortical destruction. Minimal joint effusion
Features are consistent of parosteal osteosarcoma which is low grade tumour arising from the outer periosteal layer.
This case was pathologically proved.
- Dönmez FY, Tüzün U, Başaran C et-al. MRI findings in parosteal osteosarcoma: correlation with histopathology. Diagn Interv Radiol. 2008;14 (3): 142-52. Diagn Interv Radiol (link) - Pubmed citation
- Dähnert W. Radiology review manual. Lippincott Williams & Wilkins. (2007) ISBN:0781738954. Read it at Google Books - Find it at Amazon