. Author manuscript; available in PMC: 2019 Jan 1.

Published in final edited form as: Eur Radiol. 2017 Jul 7;28(1):331–339. doi: 10.1007/s00330-017-4962-1

Table 1.

Comparison of Demographic and Clinical Characteristics and Imaging Findings between Patients with Benign and Atypical Meningiomas

	Benign Meningioma (n = 44)	Atypical Meningioma (n = 13)	P value
Age (mean ± SD), years	53.0 ± 11.95	60.0 ± 13.26	0.130
Sex (male)	12 (27.3%)	4 (30.8%)	0.805
nMTR_asym (mean ± SD)	1.67 ± 0.64	2.46 ± 0.48	< 0.001
Maximum tumour diameter (mean ± SD), mm	43.4 ± 14.7	56.4 ± 23.1	0.030
Non-skull base location	27 (61.4%)	12 (92.3%)	0.044
T2 hyperintensity	21 (47.7%)	6 (46.2%)	1.000
Peritumoural brain oedema	19 (43.2%)	9 (69.2%)	0.123
Irregular tumour margin	8 (18.2%)	4 (30.8%)	0.440
Heterogeneous enhancement	20 (45.5%)	10 (76.9%)	0.048
Capsular enhancement	8 (18.2%)	1 (7.7%)	0.668
Cystic change	2 (4.5%)	1 (7.7%)	0.547
Reactive hyperostosis	15 (34.1%)	4 (21.1%)	1.000
Skull invasion	10 (22.7%)	3 (23.1%)	1.000
Dural tail sign	29 (65.9%)	6 (46.2%)	0.215

Note—Unless otherwise indicated, data are presented as number of patients (%). P values were calculated using Student’s t-test for continuous variables and the chi-square or Fisher’s exact test for categorical variables. nMTR_asym = normalized magnetization transfer ratio asymmetry value.