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Table 2 Bone sarcoma grading

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

Grade 1 Low-grade central osteosarcoma
  Parosteal osteosarcoma
  Low-grade chondrosarcoma
  Clear cell chondrosarcoma
  Osteofibrous dysplasia-like adamantinoma
Grade 2 Periosteal osteosarcoma
  Intermediate - grade chondrosarcoma
  Classic adamantinoma
Grade 3 Osteosarcoma (conventional, telangieclatic, small cell, secondary,
  high-grade surface)
  Ewing's sarcoma
  High-grade chondrosarcoma
  Dedifferentiated chondrosarcoma
  Mesenchymal chondrosarcoma
  Dedifferentiated chordoma
  Malignant giant cell tumour
  1. (Modified from reference [7])