Pre- and postoperative self-reported and objectively assessed neurocognitive functioning in lower grade glioma patients

•Little evidence of “objective” post-therapeutic impairment in validated testing.•Patients frequently complain on “subjective” memory dysfunction.•Patients report on “subjective” cognitive and emotional executive dysfunction.•No association of “subjective” or “objective” cognitive functioning to tumor volume.•Low to non-existent association between “subjective” and “objective” measures.