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Table 4 Musculoskeletal Tumour Society staging system for bone tumours

From: Guidelines for histopathological specimen examination and diagnostic reporting of primary bone tumours

Benign tumours (G0)
Stage I - Inactive, latent (G0)
Stage II - Active (G0)
Stage III - Aggressive (G0)
Malignant tumours
Stage I - Low grade (G1)
Stage II - High grade (G2)
Stage III - Low or high grade tumours with metastases
Subdivisions
A - Intracompartmental
B - Extracompartmental