Table 2.

Confounders of resectability

	Volume epMRI		Volume follow-up MRI		EOR epMRI		EOR follow-up MRI
	Spearman rho	p value	Spearman rho	p value	Spearman rho	p value	Spearman rho	p value
Continuous variables
Age	0.162	0.367	0.264	0.087	−0.184	0.314	−0.338	0.031
Volume preoperative	0.845	<0.0001	0.818	<0.0001	−0.338	0.063	−0.572	<0.001
dT2T1 preoperative	0.269	0.143	0.159	0.334	−0.008	0.966	−0.057	0.731
Binary variables
KPS preoperative		0.870		0.683		0.917		0.700
Incidental finding		0.024		0.001		0.555		0.019
Tumor eloquence		0.940		0.659		0.917		0.642
IDH1 mutation		0.314		0.208		0.397		0.577
iMRI surgery		0.013		0.008		0.0318		0.001

Analysis of confounders of resectability. Association of continuous variables was assessed by spearman correlation analysis, binary variables were analyzed with Mann–Whitney tests. Significant values are presented in bold face

EOR extent of resection, dT2T1 difference in tumor volume expansion on preoperative T2 and T1 sequences, iMRI intraoperative MRI, KPS Karnofsky Performance Scale