NDLI: Increased cochlear fluid-attenuated inversion recovery signal in patients with vestibular schwannoma.

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Year: 2008 Volume: 29 Issue: 3

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Increased cochlear fluid-attenuated inversion recovery signal in patients with vestibular schwannoma.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bhadelia, R. A. Tedesco, K. L. Hwang, S. Erbay, S. H. Lee, P. H. Shao, W. Heilman, C.
Description	Country affiliation: United States Author Affiliation: Bhadelia RA ( Tufts-New England Medical Center and Tufts University, Boston, MA 02215, USA. rbhadeli@bidmc.harvard.edu)
Abstract	BACKGROUND AND PURPOSE: Elevated protein levels have been reported in perilymph of patients with vestibular schwannoma. Fluid-attenuated inversion recovery (FLAIR) imaging is sensitive to high protein contents in fluids. The purpose of this study was to investigate if in patients with unilateral vestibular schwannoma, cochlear FLAIR signal intensity on the affected side is increased compared with the unaffected side and control subjects. MATERIALS AND METHODS: Fifteen patients with unilateral vestibular schwannoma and 25 age-matched control subjects (without a history of hearing loss) were retrospectively evaluated. All patients and controls had routine 5-mm FLAIR and T1- and T2-weighted imaging of the brain. The signal intensity of both cochleae was evaluated by placing a small region of interest on FLAIR images. The signal intensity of the brain stem was also determined by placing a second region of interest. A ratio of cochlear signal intensity to brain stem signal intensity (CIBI ratio) was determined. A t test was used to compare the CIBI ratios. RESULTS: In patients, the mean CIBI ratio of the affected side was 0.89 +/- 0.18, and that of the unaffected side was 0.57 +/- 0.12. In control subjects, it was 0.51 +/- 0.07. The CIBI ratio of the affected side was significantly higher compared with the unaffected side (P < .001) and compared with control subjects (P < .001). CONCLUSION: Patients with vestibular schwannoma have increased cochlear FLAIR signal intensity on the affected side compared with the unaffected side and healthy subjects.
File Format	HTM / HTML
ISSN	01956108
e-ISSN	1936959X
Journal	American Journal of Neuroradiology
Issue Number	4
Volume Number	29
Language	English
Publisher	American Journal of Neuroradiology
Publisher Date	2008-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Neurology Discipline Radiology Cochlea Pathology Magnetic Resonance Imaging Neuroma, Acoustic Diagnosis Perilymph Chemistry Image Processing, Computer-assisted Proteins
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Neurology (clinical)

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