Table 3.

Radiological features of the PIS patients.

Case no.	CT	T1WI	T2WI	T2FLAIR	Enhancement	Other MRI features	Pre-operative imaging diagnosis
1	mixed density	NA	NA	NA	NA	NA	teratoma
2	NA	heterogeneous intensity	heterogeneous intensity	heterogeneous intensity	Garland-like enhancement	intradural, solid-cystic with surrounging edema	glioblastoma
3	slightly low-density	hypointensity	hyperintensity	hyperintensity	inhomogeneous enhancement	intradural, solid	hemangioblastoma
4	low-density	NA	NA	NA	NA	NA	lymphoma
5	NA	heterogeneous intensity	heterogeneous intensity	heterogeneous intensity	inhomogeneous enhancement	intradural, cystic, hemorrhage	glioblastoma
6	NA	heterogeneous intensity	heterogeneous intensity	heterogeneous intensity	inhomogeneous enhancement	intradural, cystic with surround edema, hemorrhage	glioma
7	high-density	NA	NA	NA	NA	NA	meningeoma
8	NA	hypointensity	hyperintensity	hyperintensity	non-enhanced	extradural, inner and outer the skull, skull involvement, solid,	meningeoma
9	slightly high-density	isointensity	isointensity	isointensity	inhomogeneous enhancement	extradural, skull involvement, solid,	Chondrosa rcoma
10	low-density	hypointensity	hyperintensity	hyperintensity	inhomogeneous enhancement	extradural, skull involvement, solid,	chondrosarcoma
11	low-density	hypointensity	hyperintensity	hyperintensity	non-enhanced	intradural, cystic,	acoustic neuroma
12	low-density	NA	NA	NA	NA	none	osteochondroma
13	NA	hypointensity	hyperintensity	hyperintensity	inhomogeneous enhancement	extradural, solid-cystic	meningeoma
14	NA	hypointensity	hyperintensity	hyperintensity	inhomogeneous enhancement	extradural, skull involvement, solid,	chordoma