Table 1.

Index surgery: presentation and outcome.

		n = 35
Initial presentation	Age	33.6 (15–55)
	Sex ratio (F/M)	3/1 (26/9)
	Headaches	21 (60%)
	Sensorimotor deficit	13 (37.1%)
	Neuropathic pain	23 (65.7%)
	Syringomyelia	25 (71.4%)
	Hydrocephalus	2 (5.7%)
Index surgery	Occipital craniectomy	35 (100%)
	C1 ablation	29 (82.9%)
	Duraplasty	23 (65.7%)
Clinical evolution	Headaches	6 (17.1%)
	Neurological deficit	14 (40%)
	CSF leak	10 (28.6%)
	Neuropathic pain	5 (14.3%)
	Papillary edema	2 (5.7%)
Syringomyelia evolution	No syrinx	6 (17.1%)
	Appeared	4 (11.4%)
	Decreased	3 (8.6%)
	Stable	8 (22.9%)
	Increased	14 (40.0%)