Abstract
1 . A case of parosteal osteoma with histologically low-grade sarcomatous areas is described.
2. Arteriography revealed abnormal arteries, the histological appearances of which are described.
3. Vascular shunts indicative of low-grade malignancy were also seen.
4. Reasons are given for accepting the view that this lesion is a tumour, originally benign, but liable to the development of low-grade malignancy.
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