Table 1.

Clinical and radiological details from the patient cohort in the present study (n = 18)

Patient	Sex	MMC level	CM2	Caudal position of vermis	Syrinx	HC	Shunt	CM2 regression	FMD	Shunt revision	Untethering	MRI FU (Months)	Observation (Months)
1	M	Th9-10	Yes	C4	Yes	Yes	Yes	No	No	No	1 ×	155	158
2	M	S2	No	-	No	No	No	-	-	-	3 ×	129	145
3	M	L3-4	Yes	C2	Yes	Yes	Yes	No	No	5 ×	4 ×	133	140
4	F	L3-4	Yes	C0	Yes	Yes	Yes	No	1 ×	1 ×	2 ×	98	106
5	F	Th8	Yes	C4	No	Yes	Yes	No	No	3 ×	No	95	100
6	F	S2	Yes	C2	Yes	Yes	Yes	No	No	1 ×	No	4	7
7	F	C5-6	Yes	C5	Yes	Yes	No	No	No	-	No	7	82
8	F	L3-4	Yes	C6	Yes	Yes	Yes	No	2 ×	2 ×	1 ×	69	75
9	M	L4-5	Yes	C3	No	Yes	Yes	No	No	3 ×	No	44	51
10	F	L5-S1	Yes	C4	No	Yes	Yes	No	No	1 ×	No	25	40
11	F	L5-S1	Yes	C1	No	No	No	Yes	No	-	No	24	36
12	F	Th12-L1	Yes	C4	Yes	Yes	Yes	No	No	1 ×	No	27	28
13	M	L4-5	Yes	C5	No	Yes	Yes	No	2 ×	3 ×	No	18	23
14	F	S3-4	No	-	No	No	No	-	-	-	No	14	20
15	M	L1	Yes	C3	Yes	Yes	Yes	No	No	1 ×	No	13	18
16	M	L2-3	Yes	C4	No	Yes	Yes	No	No	1 ×	No	8	15
17	M	L4-5	Yes	C5	No	Yes	Yes	No	No	2 ×	No	7	12
18	M	L3	Yes	C3	No	Yes	Yes	No	No	1 ×	No	12	12

C, cervical; CM2, Chiari malformation type 2; FMD, foramen magnum decompression; FU, follow-up; HC, hydrocephalus, L, lumbal, LS, lumbosacral; MRI, magnetic resonance imaging; S, sacral; Th, thoracal