Acoustic neuroma MRI

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] MRI findings of Acoustic neuroma are: T1

• Slightly hypointense cf. adjacent brain (63%)
• Isointense cf. adjacent brain (37%)
• May contain hypointense cystic areas

T2

• Heterogeneously hyperintense cf. to adjacent brain
• Cystic areas fluid intensity
• May have associated peritumoural arachnoid cysts

T1 C+ (Gd)

• Contrast enhancement is vivid
• But heterogeneous in larger tumours

Post-up MRI:Linear enhancement may not indicate tumour, but if there is nodular enhancement suspect tumour recurrence (needs follow up MRI).