Table 1. Topography Codes^* Used to Define Malignant Primary Osteosarcomas^† by Appendicular and Axial Sites, United States, 1999-2008.

Topography Definitions for Malignant Primary Osteosarcomas	Topography Codes
Appendicular	C40
Long bones of upper limb, scapula, and  associated joints	C40.0
Short bones of upper limb and associated joints	C40.1
Long bones of lower limb and associated joints	C40.2
Short bones of lower limb and associated joints	C40.3
Overlapping lesion of bones, joints, and  articular cartilage of limbs	C40.8
Bone of limb, NOS‡	C40.9
Axial	C41
Bones of skull and face and associated joints	C41.0
Mandible	C41.1
Vertebral column	C41.2
Rib, sternum, clavicle, and associated joints	C41.3
Pelvic bones, sacrum, coccyx, and  associated joints	C41.4
Overlapping lesion of bones, joints, and  articular cartilage	C41.8
Bone, NOS	C41.9

^*Topography codes from the American Joint Committee on Cancer (AJCC) Cancer Staging Handbook, 6th edition.

^†The analyses were limited to microscopically confirmed osteosarcomas.

^‡NOS, not otherwise specified.