Table 2.

Initial histopathological diagnoses

Tumor type (n = 55)		N	%
Diffuse glioma	Diffuse astrocytoma, IDH mutant	4	7
	Diffuse astrocytoma, IDH1 (R132H) negative	2	4
	Anaplastic astrocytoma, IDH mutant	2	4
	Anaplastic astrocytoma, IDH1 (R132H) negative	3	5
	Oligodendroglioma, IDH1 (R132H) negative, 1p/19q co-deleted	2	4
	Anaplastic oligodendroglioma, IDH1 (R132H) negative, 1p/19q co-deleted	3	5
	Glioblastoma, IDH1 (R132H) negative	11	20
	Glioma NOS	3	5
	Low grade glioma	1	2
	Diffuse low grade glioma	1	2
Other astrocytic	Pilocytic astrocytoma	1	2
	PXA	1	2
	Anaplastic PXA	2	4
Ependymal	Subependymoma	2	4
	Ependymoma	1	2
	Anaplastic ependymoma	3	5
Choroid plexus	Atypical choroid plexus papilloma	1	2
Neuronal	Dysembryoplastic neuroepithelial tumor	1	2
	Ganglioglioma variant	2	4
Embryonal	Medulloblastoma	3	5
Nerves	Schwannoma	1	2
Meningioma	Atypical meningioma	1	2
Mesenchymal	SFT/hemangiopericytoma	1	2
Metastatic	Melanocytic lesion NOS	1	2
	Metastatic high-grade NE neoplasm	1	2
Non-neoplastic	Meningioangiomatosis	1	2

NOS not otherwise specified, PXA pleomorphic xanthoastrocytoma, SFT solitary fibrous tumor, NE neuroendocrine