“ Most common benign bone tumour (up to 50% of benign lesions) and constitutes up to 15% of all bone tumours. It is composed of cortical an...
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- Most common benign bone tumour (up to 50% of benign lesions) and constitutes up to 15% of all bone tumours.
- It is composed of cortical and medullary bone with an overlying hyaline cartilage cap.
- The pathognomic feature is continuity of the lesion (‘exostosis’) with the native bone cortex and medulla.
- The lower limb is most commonly affected, typically the distal femur.
- Fractures, neurological and vascular compromise and malignant transformation are complications.
- Chondrosarcomatous change within the cartilage cap (occurring in <1% of cases) should be suspected if:
- There is an increase in pain or size (particularly aftervskeletal maturation)
- If the cartilage cap measures >1 cm (CT) or >2 cm (MRI)
- The development of ill-defined margins
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