*Majority are malignant, locally invasive but do not metastasise
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*Usually pale, soft, fleshy or friable
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*May be [[Bones Hyperplastic and Neoplastic - Pathology|osteoma or osteosarcoma, chondroma or chondrosarcoma]], fibroma or fibrosarcoma, myxoma or myxosarcoma, haemangioma or haemangiosarcoma, adenoma or adenocarcinoma