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Surgical Treatment of an Endolymphatic Sac Tumor

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Internal auditory canal metastasis.

A Della Puppa¹, M Rossetto, F Berti

¹Department of Neurosurgery, Padua University Hospital, Padua, Italy. alessandro.dellapuppa@sanita.padova.it

Journal of Neurosurgical Sciences

|March 23, 2011

Summary

This summary is machine-generated.

Inner auditory canal metastasis, a rare event, often presents as rapid cranial nerve palsy. This distinct entity offers a better prognosis but carries a higher risk of leptomeningeal seeding.

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Area of Science:

Neurology
Oncology
Otolaryngology

Background:

Metastasis to the inner auditory canal (IAC) is exceptionally rare.
Clinical presentation typically involves rapid cranial nerve palsy, particularly facial nerve involvement.

Observation:

A 56-year-old female with a history of malignancy presented with peripheral facial nerve palsy.
MRI revealed two posterior fossa tumors, one infiltrating the IAC, affecting the VII-VIII nerve complex.
Despite corticosteroid treatment, facial nerve palsy rapidly worsened.

Findings:

Surgical extirpation of the IAC tumor was only partially feasible due to extensive nerve involvement.
Posterior wall drilling of the internal auditory canal improved facial palsy symptoms.
Leptomeningeal spinal seeding occurred post-operatively, necessitating spinal irradiation.

Implications:

High awareness of IAC metastasis is crucial in patients with prior malignancy and rapid progressive VII nerve palsy.
IAC metastasis appears distinct from temporal bone and CPA metastases, with unique clinical features, prognosis, and therapeutic strategies.
While complete surgical removal is rare, symptom relief is achievable, and IAC metastasis may portend a better prognosis despite increased leptomeningeal seeding risk.