 | These lateral and AP radiographs of the distal femur demonstrated a bone forming lesion originating from the posterior cortex of the femur and extending into the posterior soft tissue but not into the medullary canal. This has the radiographic appearance of parosteal OGS which is a relatively slowly growing surface bone forming tumor of low grade malignancy.
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 | This lesion was unnecessarily biopsied through an extensive popliteal exposure which could have, but did not disseminate the tumor widely. Note the neurovascular structures. |
 | Histosections of her biopsy reveal slowly growing new bone compatible with paraosteal osteosarcoma. The same lesion is seen on the routine AP and Lat views. This fairly mature new bone is similar to what is seen in myositis ossificans. |
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 | The diagnosis was parosteal osteogenic sarcoma, A II. Our plan was to perform a wide resection, including adjacent femoral cortex preserving limb and preserving the knee joint. You can see the resected specimen on a drawing of the tumor bed. Tumor was not present within the medullary canal. |
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 | This histosection of the entire lesion and the underlying posterior cortex of the femur indicate the wide resection carried out. |
 | Here are radiographs ten years later. Autografts from her pelvis had been placed in the cortical defect at the time of resection. She is now asymptomatic and has normal function with a full range of knee motion 25 years after her wide resection. |
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