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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