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Outcome of using magnetic resonance imaging as an initial screen to exclude vestibular schwannoma in patients presenting with unilateral tinnitus

Published online by Cambridge University Press:  29 June 2007

P. J. D. Dawes*
Affiliation:
Department of Otolaryngology, Sunderland Royal Infirmary, Tyne and Wear, UK.
H. E. Basiouny
Affiliation:
Department of Otolaryngology, Sunderland Royal Infirmary, Tyne and Wear, UK.
*
Address for correspondence: Mr P. J. D. Dawes, ENT Department, Dunedin Hospital, 201 Great King Street, Dunedin, New Zealand. Fax: 0064 3 4747956

Abstract

The improved cost-effectiveness of gadolinium-enhanced magnetic resonance imaging (MRIg) as a diagnostic tool for vestibular schwannoma has resulted in smaller tumours being diagnosed. There has been a change in the clinical presentation of these tumours and up to four per cent may present with unilateral tinnitus. The limitation of auditory brain stem response (ABR) as a screening tool that detects small tumours is recognized and there is a strong argument for using MRIg as the initial investigation.

Various screening guidelines have been proposed, some include submitting patients with unilateral tinnitus for MRIg. This report describes the findings in a group of 174 patients presenting with unilateral tinnitus who underwent MRIg as part of a guideline-directed screen to exclude vestibular schwannoma. Five patients had a cause for their tinnitus diagnosed, one a vestibular schwannoma. Two had intracranial aneurysms and another three had pathology revealed that merited onward referral. A further nine patients had incidental findings that neither accounted for their symptoms nor needed further investigation or referral.

The rationale for screening these patients with MRIg is discussed.

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Type
Main Articles
Copyright
Copyright © JLO (1984) Limited 1999

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