Mastoid segment facial nerve schwannoma
MRI brain for surgical planning of left posterior fossa meningioma.
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MRI brain gadolinium enhanced T1 weighted images demonstrate an enhancing nodule in the mid segment of the right facial nerve (arrow). The normal mastoid segment of the left facial nerve is also shown (arrow head). This is an incidental finding and the evaluated left posterior meningioma is not shown.
Facial nerve schwannoma is a rare benign tumour. As schwannomas elsewhere it originates from the surface of the nerve, and displace and splay the nerve fibres over their eccentric growth.