Fast spin echo MRI in otology

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Abstract
Magnetic resonance imaging (MRI) using a fast spin echo protocol (FSE) gives greatly improved spatial resolution for the inner ear and its central connections. Excellent contrast resolution between bone, neural tissue and intracranial fluids is obtained on the heavily T2 weighted images. The contents of the internal auditory meatus (IAM) are shown more clearly than on Tl weighted images, even with gadolinium enhancement. Use of the technique for congenital, vascular, granulomatous and obliterative lesions of the inner ear is described. The cochlear and vestibular nerves can be seen side by side in the majority of cases thereby excluding the presence of even an intrameatal acoustic neuroma. This means that FSE can be used as a first line investigation to exclude small vestibular schwannomas without the need for gadolinium. Gadoliniumenhanced Tl weighted sequences are still necessary for confirmation of some tumours or for inflammatory lesions.

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