120
Tumours of Bone and Soft Tissues
Bone (ICD‐O‐3 C40, 41) Rules for Classification The classification applies to all primary malignant bone tumours except malignant lymphoma, multiple myeloma, surface/juxtacortical osteosarcoma, and juxtacortical chondrosarcoma. There should be histological confirmation of the disease and division of cases by histological type and grade. The following are the procedures for assessing T, N, and M categories: T categories Physical examination and imaging N categories Physical examination and imaging M categories Physical examination and imaging
Regional Lymph Nodes The regional lymph nodes are those appropriate to the site of the primary tumour. Regional node involvement is rare and cases in which nodal status is not assessed either clinically or pathologically could be considered N0 instead of NX or pNX.
TNM Clinical Classification T – Primary Tumour TX Primary tumour cannot be assessed T0 No evidence of primary tumour
Appendicular Skeleton, Trunk, Skull and Facial Bones T1 Tumour 8 cm or less in greatest dimension T2 Tumour more than 8 cm in greatest dimension T3 Discontinuous tumours in the primary bone site Spine T1 Tumour confined to a single vertebral segment or two adjacent vertebral segments T2 Tumour confined to three adjacent vertebral segments