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a A fibro-osseous pattern showing woven bone in the pattern of “Chinese letters” arranged in a spindle cell background (×40). b Fibro-osseous pattern with a predominance of spindle cells. Bone formation is minimal. c Fibro-osseous pattern showing broad plates of osteoid in a collagenized fibroblastic stroma. d Fibro-osseous pattern of globules of osteoid in a loose fibrous tissue background. This globular pattern has been called “cementum” (×40)
