Findings: There is a unilateral 4mm x 3mm x 2mm enhancing ovoid lesion in the left auditory canal near the left CPA.

Key points – Vestibular schwannoma:

* Benign tumor of Schwann cells that encircle the vestibulocochlear nerve in the CPA and IAC
* Most common mass in CPA
* Often presents with progressive hearing loss
* 100% enhance; appears as “filling defect” in CSF on T2
* Rarely associated with dural tail or arachnoid cyst
* Unilateral enhancing CPA mass is vestibular schwannoma until proven otherwise.
* Usually slow growing with peak age 40-60yrs
* If complete hearing loss has occurred, resection will not help restore hearing.

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Case submitted by Brian Casey from Auntminnie (Source:


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