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Fibroblastic Osteosarcoma

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Approximately 25% of osteosarcomas consist predominantly of spindle tumor cells and can be classified as fibroblastic osteosarcoma. Osteoid production is minimal and seen focally; although in this case, osteoid matrix was readily found. Fibroblastic osteosarcomas are highly vascular and may resemble hemangiopericytoma.

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