**Note 1:** Physician statement of Bone Invasion can be used to code this data item when no other information is available.
**Note 2:** Record bone invasion as determined by relevant imaging only for the primary tumor. Imaging methodologies include computed tomography (CT) scans and magnetic resonance imaging (MRI).
**Note 3:** Code 0 if relevant imaging is performed and there is no mention of bone invasion.
**Note 4:** Code 9 if there is no relevant imaging of the primary site.