DEFINITION AND PATHOGENESIS
- Formed of at least two unrelated types of tumor, not including fibrosarcoma and MFH
- Rare, with only 8 reported cases in the literature as of 1983
- Most pts reported in the mid-teen years
- Fibular location accounting for a third of all cases
- ? spiculated periosteal reaction, Codman triangle
- MRI may demonstrate an associated soft tissue mass
- Grayish yellow lobulated mass
- Liposarcoma and osteosarcoma are the two most common malignant tissues of mesenchymal origin encoun-tered
- Sampling error may give initial dx of liposarcoma
DIFFERENTIAL CLINICOPATHOLOGIC DIAGNOSIS
DISEASE COURSE AND TREATMENT
- High rate of LR
- Wide resection
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Scheele PM Jr, Von Kuster LC, Krivchenia G 2nd: Primary malignant nesenchymoma of bone. Arch Pathol Lab Med 14:614-7,1990.
Sumner TE, Ward WG, Kilpatrick SE, Opatowsky MJ: Fibrocartilaginous mesenchymoma of bone: case report and review of the literature. Pediatr Radiol 30:315-7,2000.