Chondrosarcoma is the commonest primary sarcoma of bone in adults, with a male predominance. Patients are usually between 30 and 70 years old. Clinical symptoms are pain and tenderness with or without a mass, the average duration of symptoms being 1-2 years, but growth may be very slow, especially for pelvic tumours. Chondrosarcomas characteristically produce coalescent cartilage lobules of various size. The center often becomes necrotic or cystic.