Surgery Technic

Suboccipital cranioectomy without duraplasty

Suboccipital cranioectomy with duraplasty

Number

Percentage

Number

Percentage

Syrinx Segment

None

16

55.2%

8

47.1%

Cervical

5

17.2%

5

29.4%

Cervicothoracic

7

24.1%

3

17.6%

Holocord

1

3.4%

1

5.9%

Preoperative Tonsiller Level

C1

19

65.5%

6

35.3%

C2

4

13.8%

2

11.8%

C1-C2 compound

3

10.3%

4

23.5%

C2-C3 compound

1

3.4%

0

0.0%

Foramen Magnum-C1

2

6.9%

5

29.4%