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WHO classification of bone tumors

Cartilage tumors

Osteochondroma - ICD-O 9210/0

Osteochondromatosis, NOS - ICD-O 9210/1

Chondroma - ICD-O 9220/0

Enchondroma - ICD-O 9220/0
Periosteal chondroma - ICD-O 9221/0
Enchondromatosis - ICD-O 9220/1

Chondroblastoma - ICD-O 9230/0
Chondromyxoid fibroma - ICD-O 9241/0
Chondrosarcoma - ICD-O 9220/3

Central, primary, and secondary - ICD-O 9220/3
Peripheral - ICD-O 9221/3
Dedifferentiated - ICD-O 9243/3
Mesenchymal - ICD-O 9240/3
Clear cell - ICD-O 9242/3

Osteogenic tumors

Osteoid osteoma - ICD-O 9191/0
Osteoblastoma - ICD-O 9200/0
Osteosarcoma - ICD-O 9180/3

Conventional - ICD-O 9180/3

chondroblastic - ICD-O 9181/3
fibroblastic - ICD-O 9182/3
osteoblastic - ICD-O 9180/3

Telangiectatic - ICD-O 9183/3
Small cell - ICD-O 9185/3
Low grade central - ICD-O 9187/3
Secondary - ICD-O 9180/3

Paget osteosarcoma - ICD-O 9184/3
Postradiation osteosarcoma - ICD-O 9180/3

Parosteal - ICD-O 9192/3
Periosteal - ICD-O 9193/3
High grade surface - ICD-O 9194/3

Fibrogenic tumors

Desmoplastic fibroma - ICD-O 8823/0
Fibrosarcoma - ICD-O 8810/3

Fibrohistiocytic tumors

Benign fibrous histiocytoma - ICD-O 8830/0
Malignant fibrous histiocytoma - ICD-O 8830/3

Ewing sarcoma / Primitive neuroectodermal tumor

Ewing sarcoma / - ICD-O 9260/3
PNET - ICD-O 9364/3

Hematopoietic tumors

Plasma cell myeloma - ICD-O 9732/3
Malignant lymphoma, NOS - ICD-O 9590/3

Giant cell tumor

Giant cell tumor - ICD-O 9250/1
Malignancy in giant cell tumor - ICD-O 9250/3

Notochordal tumors

Chordoma, NOS - ICD-O 9370/3
Chondroid chordoma - ICD-O 9371/3
"Dedifferentiated" chordoma - ICD-O 9372/3

Vascular tumors

Hemangioma - ICD-O 9120/0
Angiosarcoma - ICD-O 9120/3

Smooth muscle tumors

Leiomyoma - ICD-O 8890/0
Leiomyosarcoma - ICD-O 8890/3

Lipogenic tumors

Lipoma - ICD-O 8850/0
Liposarcoma - ICD-O 8850/3

Neural tumors

Schwannoma - ICD-O 9560/0

Miscellaneous tumors

Adamantinoma - ICD-O 9261/3
Metastatic malignancy

Miscellaneous lesions

Aneurysmal bone cyst
Simple cyst
Fibrous dysplasia
Osteofibrous dysplasia
Langerhans cell histiocytosis, NOS - ICD-O 9751/1
Erdheim-Chester disease
Chest wall hamartoma

Joint lesions

Synovial chondromatosis - ICD-O 9220/0