Table 4.

Patients according to SGSCC

Tumor size (TED)	n (%)
< 2 cm	8 (6)
2 cm to 3.9 cm	81 (57)
4 cm to 5.9 cm	51 (36)
> 5.9 cm	2 (1)
Tumor sites	n (%)
≤ 3	74 (52)
> 3	68 (48)
Vascular involvement	n (%)
≤ 1	73 (51)
> 1	69 (49)
Intradural invasion	n (%)
No	18 (13)
Slight	38 (27)
With brainstem compression	86 (60)
Recurrence after prior treatment	n (%)
No	121 (85)
After surgery	20 (14)
After RT	0 (0)
After Surgery and RT	1 (1)
Total Score	n (%)
< 8	40 (28)
8 to 12	83 (59)
> 12	19 (13)

SGSCC Sekhar Grading System for Cranial Chordoma, TED tumor equivalent diameter, RT radiotherapy