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A Concept for MRI-Based Cholesteatoma Detection in Cochlear Implant Recipients
Lukas Woltersdorf1, Rayoung Kim1, Alexander Rempen1
1Department of Otolaryngology, Head and Neck Surgery, Medical School OWL, Bielefeld University, Campus Mitte, Klinikum, 33604 Bielefeld, Germany.
Audiology Research
|November 24, 2025
Summary
This study shows that specific magnetic resonance imaging (MRI) sequences and patient positioning can detect cholesteatomas in patients with cochlear implants (CI). This improves postoperative follow-up after CI surgery and subtotal petrosectomy.
Area of Science:
- Medical Imaging
- Otolaryngology
- Neurosurgery
Background:
- Cochlear implantation (CI) is a primary treatment for severe hearing loss.
- Cholesteatomas, which can cause deafness, often require subtotal petrosectomy combined with CI.
- Clinical follow-up for residual cholesteatomas is challenging due to blind sac closure difficulties and MRI artifacts from CIs.
Purpose of the Study:
- To develop a magnetic resonance imaging (MRI) procedure for detecting cholesteatomas in patients with cochlear implants (CIs).
- To overcome challenges posed by CI-related MRI artifacts in postoperative cholesteatoma assessment.
Main Methods:
- Ex vivo MRI scans were conducted on five volunteers with fixed cochlear implants (Medel Synchrony) at 1.5 T and 3 T.
- Utilized various MRI sequences, including EPI, HASTE, and RESOLVE.
- Investigated the impact of distal implant positioning (12 cm from EAC) and anteversional head positioning on image quality.
Main Results:
- EPI sequences with CIs prevent assessment of ipsilateral and contralateral mastoids due to artifacts.
- Cholesteatoma-detecting MARS sequences (HASTE, RESOLVE) combined with distal implant and specific head positioning enable ipsilateral mastoid assessment.
Conclusions:
- Postoperative cholesteatoma assessment after CI and subtotal petrosectomy is feasible at 1.5 T and 3 T.
- Successful assessment depends on careful selection of MRI sequence, implant position, and head position.
