Bone Sarcomas
A 19-year-old male presents with a slowly growing, mildly painful mass on the anterior aspect of his mid-femur that he noticed 6 months ago. Examination reveals a firm, fixed mass over the anterior tibial diaphysis. Radiographs show a surface-based lesion arising from the diaphyseal cortex with "sunburst" periosteal reaction and a soft tissue mass; the medullary cavity appears uninvolved. CT confirms cortical scalloping without medullary extension. Biopsy reveals intermediate-grade cartilaginous and osteoid matrix with moderate atypia. Regarding periosteal osteosarcoma:
Mark each as TRUE or FALSE
Periosteal osteosarcoma is a rare surface (juxtacortical) osteosarcoma arising from the periosteal s...
The three juxtacortical osteosarcomas are: parosteal (low-grade, arises from outer periosteum, metap...
Periosteal osteosarcoma is the most common osteosarcoma subtype; it arises from the medullary cavity...
Imaging features: surface-based lesion on the diaphyseal cortex, perpendicular "sunburst" or "hair-o...
Treatment: wide surgical resection is the mainstay; the role of chemotherapy is debated - some cente...
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Click T (True) or F (False) for each option