Number

Percentage

Gender

Female

25

54.3%

Male

21

45.7%

Pain

18

39.1%

Motor Deficit

19

41.3%

Sensory Deficit

23

50.0%

Sphincter Disorder

1

2.2%

Another Symptoms

30

65.2%

Headache

25

54.3%

Motor Neuron Upper/Lower

16

34.8%

Brainstem Cranial Nerve Involvement

6

13.0%

Cerebellar Involvement

16

34.8%

Hydrocephalus Symptom

2

4.3%

Preoperative Syrinx

22

47.8%

Syrinx Segment

None

24

52.2%

Cervical

10

21.7%

Cervicothoracic

10

21.7%

Holocord

2

4.3%

Preoperative Tonsiller Level

C1

25

54.3%

C2

6

13.0%

C1-C2 compound

7

15.2%

C2-C3 compound

1

2.2%

Foramen Magnum-C1

7

15.2%

Osseous Anomaly

None

44

95.7%

Platibazi

1

2.2%

Scoliosis

1

2.2%

Preoperative Sisterna Magna

None

38

82.6%

Minimal

8

17.4%

Preoperative Obex

Unaware

29

63.0%