Table 2.

Clinical characteristics of patients with versus without epilepsy before surgery

	Epilepsy before Surgery		P
	Yes	No
	N = 244 (31.3%)	N = 535 (68.7%)
Age at diagnosis, y
Median	56	58	.265
Range	18–88	19–87
Sex, N (%)
Male	85 (34.8)	162 (30.3)	.214
Female	159 (65.2)	373 (69.7)
WHO grade, N (%)
I	200 (82.0)	438 (81.9)	.765
II	38 (15.6)	81 (15.1)
III	6 (2.5)	16 (3)
Locationa, N (%)
Convexity	77 (35.9)	90 (19.1)	<.001
Parasagittal	39 (18.7)	92 (20.7)	.555
Skull base	81 (38.8)	179 (40.2)1	.733
Posterior fossa	9 (4.3)	72 (16.2)	<.001
Other	5 (1.9)	17 (3.8)	.347
Maximal diameterb, mm
Median	42	40	.088
Range	11–89	12–100
Simpson gradec, N (%)
1	51 (35.9)	92 (28.2)	.295
2	57 (40.1)	162 (49.7)
3	15 (10.6)	26 (8.0)
4	15 (10.6)	39 (12.0)
5	4 (2.8)	7 (2.1)
Multiple meningiomas, N (%)
Yes	35 (14.3)	90 (16.8)	.402
No	209 (85.7)	445 (83.2)
Neurological deficit before surgeryd, N (%)
Yes	104 (42.6)	275 (51.4)	.023
No	140 (57.4)	269 (48.6)
Outcome of neurological deficits after surgery, N (%)
Recovered	57 (54.8)	82 (29.8)	<.001
Residual deficit	19 (18.3)	105 (38.2)
Not improved	28 (26.9)	88 (32.0)
Epileptiform EEG potentialsf, N (%)
Yes	25 (21.9)	15 (10.8)	.016
No	89 (78.1)	124 (89.2)
Tumor progression, N (%)
Yes	51 (20.9)	152 (28.4)	.027
No	193 (79.1)	383 (71.6)

^aN = 661, not including patients with multiple meningiomas.

^bDocumentation available for 694 patients (CT/MRI = 631/63).

^cDocumentation available for 468 patients.

^dNot including headache and seizures.

^ePatients with perioperative-onset neurologic deficits and a minimum follow-up of 1 year (N = 338).

^fDocumentation of preoperative EEG recordings available for 253 patients.