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Metaphyseal Fibrous Defect (Non-ossifying Fibroma)

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Comments:
Microscopically, they consist of a spindle cell proliferation with a loose storiform pattern. Mitotic activity may be increased but there is no cytologic atypia. Spindle cells often contain yellow-brown hemosiderin deposits. Numerous benign giant cells are present which may lead to mistaken diagnosis of a giant cell tumor.

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