Paediatric Benign
Fibrous dysplasia 1-50
Simple bone cyst 1-15
Osteoid osteoma 5-35
Chondroblastoma 10-30
Aneurysmal bone cyst 10-45

Paediatric Malignant
Ewings PNET5-20
Osteosarcoma 5-25
Chondrosarcoma 20-55

Benign
Giant cell tumour 15-45
Non ossifying fibroma 5-20
Fibrous dysplasia 1-50
Osteochondroma 1-50
Osteoid osteoma 5-35
Chondroblastoma 10-30
Enchondroma 10-60
Simple bone cyst 1-15
Eosinophilic granuloma 1-35
Chondromyxoid fibroma 1-25

Malignant
Osteosarcoma 5-25
Chondrosarcoma 20-55
Fibrosarcoma 10-75
Ewings PNET5-20