Lesion

Number

Benign lesion

136

Chondroma

48

Giant Cell Tumor

17

Aneurysmal Bone Cyst

21

Fibrous dysplasia

14

Chondroblastoma

5

Others (e.g. Histiocytic fibroma, Intraosseous lipoma, Periosteal chondroma)

31

Malignant lesion

152

Osteosarcoma

29

Chondrosarcoma

20

Metastatic Tumor

68

Lymphoma/ Myeloma

30

Others (e.g. Leiomyosarcoma, Biphasic synovial sarcoma)

5

Non-tumor

(e.g. Bone necrosis, Granuloma, Bone marrow reconversion, Metabolic diseases)

78

Undiagnostic

10

PCB repeated in 7 cases

Benign lesion

2

Fibrous dysplasia

1

Hemangioma

1

Malignant lesion

1

Ewing’s sarcoma

1

Non-tumor (e.g. Bone necrosis)

3

Undiagnostic

1