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(Radiology. 2000;215:458-462.)
© RSNA, 2000

Neuroradiology

Cochlear Fossa Enhancement at MR Evaluation of Vestibular Schwannoma: Correlation with Success at Hearing-Preservation Surgery1

Frédérique Dubrulle, MD, Olivier Ernst, MD, Christophe Vincent, MD, François M. Vaneecloo, MD, Jean Paul Lejeune, MD and Laurent Lemaitre, MD

1 From the Department of Radiology, Hopital Huriez-Sud, Centre Hospitalier Universitaire de Lille, 1 Place de Verdun, 59037 Lille, France (F.D., O.E., L.L.); the Departments of Otoneurology (C.V., F.M.V.) and Neurosurgery (J.P.L.), Hopital Roger Salengro, Centre Hospitalier Universitaire de Lille, France. From the 1998 RSNA scientific assembly. Received November 2, 1998; revision requested December 21; final revision received September 17, 1999; accepted September 29. Address correspondence to F.D. (e-mail: fdubrulle@caramail.com).

PURPOSE: To describe a sign in magnetic resonance (MR) imaging that could reflect the state of the cochlear nerve before hearing-preservation surgery in small vestibular schwannomas.

MATERIALS AND METHODS: Thirty-one patients with serviceable hearing underwent 1.5-T MR imaging before hearing-preservation surgery. The presence of cochlear fossa enhancement on T1-weighted spin-echo images obtained after the administration of contrast material was compared with the results of hearing-preservation surgery.

RESULTS: Cochlear fossa enhancement was present in 13 patients, and all of them had total hearing loss after surgery. There was no cochlear fossa enhancement in 18 patients; 15 maintained serviceable hearing after surgery, and three had postoperative hearing loss with no serviceable hearing (sensitivity, 81%; specificity, 100%).

CONCLUSION: Cochlear fossa enhancement on T1-weighted spin-echo images seems to be a reliable sign for analyzing the state of the cochlear nerve. The absence of cochlear fossa enhancement could become an additional criterion for selecting the surgical approach in vestibular schwannomas.

Index terms: Ear, MR, 213.121411, 213.12143 • Ear, neoplasms, 213.364 • Hearing loss, 213.1267 • Magnetic resonance (MR), contrast enhancement, 213.12143 • Magnetic resonance (MR), high-resolution, 213.121411, 213.12143 • Nerves, cranial, 213.364 • Nerves, MR, 213.121411, 213.12143 • Schwannoma, 213.364




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