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© 2002 by the American Institute of Ultrasound in Medicine
J Ultrasound Med 21:555-557 • 0278-4297

Technical Advance

Sonographic Imaging of Foramen Ovale Electrodes

Christoph Kurth, MD and Bernhard J. Steinhoff, MD

Department of Neuropediatrics, University of Kiel, Kiel, Germany (C.K.); and Epilepsiezentrum Kork, Kehl-Kork, Germany (B.J.S.).

Address correspondence and reprint requests to Christoph Kurth, MD, Klinik für Neuropädiatrie, Universität Kiel, Schwanenweg 20, 24105 Kiel, Germany.

Objective. In patients with medically intractable partial epilepsy of mesiotemporal origin, video electroencephalographic monitoring with foramen ovale electrodes is necessary to plan neurosurgical interventions. Imaging of these electrodes after implantation hitherto required conventional radiography, magnetic resonance imaging, or computed tomography of the skull. These methods are expensive. Therefore, the aim of our work was to show the capability of more cost-effective transcranial B-mode sonography for visualization of the electrodes. Methods. In this pilot study, a 42-year-old female patient with implanted foramen ovale electrodes was examined transtemporally with a 2-MHz sector transducer to visualize the intracranially implanted electroencephalographic recording device. Results. Foramen ovale electrodes could be detected easily in the patient, and bedside monitoring of explantation was possible. Conclusions. We were able to show the applicability of transcranial B-mode sonography for visualization of foramen ovale electrodes in preoperative electroencephalographic monitoring of patients with epilepsy. Further evaluation of this method in additional patients will follow.

Abbreviations: FO, foramen ovale

Key Words: foramen ovale • foramen ovale electrodes • sonography • imaging • electroencephalography • epilepsy surgery

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