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Table 2 Criteria for the SGSCC

From: Prognostic impact of the “Sekhar grading system for cranial Chordomas” in patients treated with pencil beam scanning proton therapy: an institutional analysis

Tumor size (TED)

0–4 points

  < 2 cm

1

 2 cm to 3.9 cm

2

 4 cm to 5.9 cm

3

  > 5.9 cm

4

Tumor sites

1 point each

 Upper clivus

 

 Middle clivus

 

 Lower clivus

 

 Left petrous bone

 

 Right petrous bone

 

 Left cavernous sinus

 

 Right cavernous sinus

 

 C1/2/3 left

 

 C1/2/3 right

 

Vascular involvement

1 point each

 Left carotid artery

 

 Right carotid artery

 

 Basilar artery

 

 Left vertebral artery

 

 Right vertebral artery

 

Intradural invasion

0–2 points

 No

0

 Slight

1

 With brainstem compression

2

Recurrence after prior treatment

0–5 points

 No

0

 After surgery

2

 After RT

3

 After Surgery and RT

5

  1. TED tumor equivalent diameter, C1/2/3 cervical vertebrae 1–3, RT radiotherapy