Table 1.

Clinical factors and MRI features of brain invasion and non-invasion groups in meningioma (mean ± SD or no, %)

Characteristics	Brain invasion (n = 81)	Non invasion (n = 577)	Univariate analysis (p value)
Clinical factors
Age (years)	52.5 ± 10.5	52.2 ± 10.70	0.833
Sex			< 0.001*
Female	48 (59.3%)	474(82.1%)
Male	33 (40.7%)	103 (17.9%)
Imaging features
Maximum diameter (mm)	52.44 ± 15.05	35.88 ± 14.28	< 0.001*
Tumour shape			< 0.001*
Circular or quasi- circular	23 (28.4%)	447(77.5%)
Irregular	58 (71.6%)	130 (22.5%)
Tumour boundary			< 0.001*
Clear	63 (77.8%)	548(95%)
Blur	18 (22.2%)	29(5%)
Dural tail sign			0.341
Yes	41(50.6%)	257(44.5%)
None	40(49.4%)	320(55.5%)
Peritumoural oedema			< 0.001*
1 Uncertain	0(0%)	0(0%)
2 None (0%)	6(7.4%)	329(57.0%)
3 ≤ 5%	9(11.1%)	71(12.3%)
4 6–33%	20(24.7%)	84(14.6%)
5 34–67%	22(27.2%)	55(14.0%)
6 68–95%	23(28.4%)	33(6.7%)
7 > 95%	1(1.2%)	5(0.9%)
MRI signal
T2WI			0.115
Slightly high signal	34 (42.0%)	191 (33.1%)
Iso signal	22 (27.2%)	221 (43.2%)
Mixed signal	25 (30.8%)	165 (28.6%)
Enhanced features			< 0.001*
Uniform	19 (23.5%)	418(72.4%)
Uneven enhancement	62 (76.5%)	159(27.6%)
Bone invasion			0.124
Yes	36(44.4%)	195(33.8%)
No	45(55.6%)	382(66.2%)
Sinus invasion			0.381
Yes	24(29.6%)	158(27.4%)
No	57(70.4%)	419(72.6%)

Among peritumoural oedema, percentage represents the proportion of peritumoural oedema in the entire abnormality, and the entire abnormality may be comprised of the entire tumour and oedema component. A Student’s t-test was used to compare the difference in age and maximum diameter, while the chi-square test was used to compare the difference in other features. *P < 0.05

SD standard deviation