Endoscopically controlled surgery with open hemilaminectomy for the treatment of intradural extramedullary tumors: an operative technique and short-term outcomes of 20 consecutive cases

Table 1 Patient characteristics, surgical information and outcome evaluation

Patient	Sex	Age	Level	Location	Resection of Simpson grade	Surgery duration (h)	Blood loss (mL)	Pathology
1	Female	67	L4	Ventrolateral		3.5	200	Schwannoma
2	Male	67	T12	Lateral		2.8	200	Schwannoma
3	Female	54	T7-T8	Ventrolateral	II	5.5	400	Meningioma
4	Female	45	T11-T12	Posteriorly		4.3	200	Schwannoma
5	Female	49	T5-T6	Posteriolateral	I	5	200	Meningioma
6	Female	23	T2-T3	Ventral	I	4	200	Meningioma
7	Female	42	T6-T7	Ventrolateral		2.5	300	Schwannoma
8	Male	47	L5-S1	Lateral		4.5	300	Schwannoma
9	Male	58	T10	Ventrolateral		3	100	Schwannoma
10^a	Female	29	T9-T12	Ventrolateral		6.5	600	Neurofibromatosis
11	Female	33	T5	Ventrolateral	II	2.4	200	Meningioma
12	Female	24	T2-T4	Posteriorly	II	3.5	200	Meningioma
13	Male	47	T11-L1	Ventral		4	300	Schwannoma
14	Male	43	L4-L5	Posteriorly		2.2	100	Schwannoma
15	Male	28	T11-T12	Posteriorly		3.0	200	Schwannoma
16	Female	34	T3-T4	Ventrolateral	II	4.5	250	Meningioma
17	Female	43	T9-T10	Posteriorly		2.5	300	Schwannoma
18	Female	37	L4-L5	Ventrolateral		2.5	150	Schwannoma
19	Male	58	T2	Posteriorly		3.0	300	Meningioma
20	Male	18	T9	Posteriorly		2.5	200	Schwannoma

ISSN: 2057-4967