Radiology Cases Chondrosarcoma

Description: This tumour occurs after bone fusion usually between 30 and 60 yrs. 20% of all cases of primary malignant bone tumours are of this type. The pelvis and ribs, i.e. flat bones, are commoner sites. The mostly frequently involved long bone is the proximal end of femur. The tumour is rarely found distal to the knees and the elbows. With large tumours, the site of origin is inferred from the centre of radius of the mass. Some people regard the presence of a chondroma of a flat bone to be a pre-malignant condition. Certainly in some families there is as much as a 10% chance of malignant transformation.