Safety and efficacy of posterior approach for resection of spinal meningioma: Impact of dural attachment location

Table 2 Demographics, clinical characteristics and histological features of all pooled patients, mean ± SD (range)

Variable	Value
Cohort size (n)	34
Age (years)	62.09 ± 10.8 (27-83)
Sex
Male	10
Female	24
Tumor level
Cervical	2
Thoracic	32
Dural attachment location
Dorsal/dorsolateral	13
Ventral/ventrolateral	14
Lateral	7
Tumor length
< 1 cm	2
1-2 cm	24
> 2 cm	8
Preoperative MMG
I/II	6
III/IV/V	28
Symptoms
Pain/myelopathy	31
Incidental	3
Duration of symptoms (months)	15.12 ± 16.86 (0-72)
Hospital length of stay (days)	19.68 ± 7.91 (9-39)
Follow-up duration (months)	22.65 ± 12 (6-36)
Operative time (minutes)	176.76 ± 50.22 (80-310)
Intraoperative blood loss (mL)	520.59 ± 380.41 (100-1700)
Calcification
No	25
Yes	9
Histological types
Meningothelial	17
Psammomatous	10
Transitional	4
Fibrous	2
Atypical	1
WHO grade
1	33
2	1
Simpson grade
1	5
2	29
Instrument fusion
No	11
Yes	23
Perioperative complications
CSF leakage	3
Pneumonia	1
Urinary tract infection	1
Recurrence	1

MMG: Modified McCormick grade; WHO: World Health Organization; CSF: Cerebral spinal fluid.