Differentiation of vestibular schwannomas from meningiomas of the internal auditory canal using perilymphatic signal evaluation on T2-weighted gradient-echo fast imaging employing steady state acquisition at 3T

European Radiology Experimental

Table 1 Axial T1W contrast-enhanced-based seven-item checklist for the diagnosis of typical vestibular schwannoma versus IAC meningioma

	IAC centric^a	Anterior extension^b > 1 cm	IAC dilation^c	Tumour axis perpendicular to petrous bone^d	Tumour axis parallel to petrous bone^e	Acute tumour-bone angle^f	Dural tail^g
VS	+	-	+	+	-	+	-
IAC M	-	+	-	-	+	-	+

VS vestibular schwannoma, IAC M internal auditory canal meningioma
^aCentric location of the tumour to the IAC
^bExtension of the tumour further than 1 cm from the anterior wall of the IAC
^cDilation of the IAC by the tumour
^dThe tumour’s axis is perpendicular to the petrous bone
^eThe tumour’s axis is parallel to the petrous bone
^fThe angle between the tumour and the posterior wall of the petrous bone is acute
^gThickening and enhancement of the meninges adjacent to the tumour