[Inflammatory facial paralysis in MRI. An overview]
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Updated: Nov 2, 2026
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Published on: March 1, 2015
S Sartoretti-Schefer1, W Wichmann, A Valavanis
1Institut für Neuroradiologie, Universitätsspital Zürich.
Abstract:
In inflammatory peripheral facial nerve palsy pathologically intense, linear and smooth enhancement of the distal intrameatal nerve segment can always be observed on T1-w- SE- MR sequences. The other nerve segments often present with a pathological enhancement as well. On T2-w- SE sequences, a thickening of the distal intrameatal nerve segment can be observed. The pathological enhancement persists over weeks and months; even in patients with complete clinical recovery, a persistent enhancement of the distal intrameatal nerve segment can be demonstrated. No correlation can be established between the intensity of the enhancement, the clinical condition and the electrophysiological data on electroneurography. The persistent enhancement of the different nerve segments is due to a long-lasting breakdown of the blood-peripheral nerve-barrier related to the process of degeneration and regeneration of the facial nerve in inflammatory palsy.
Insights
Inflammatory facial palsy shows persistent nerve enhancement on MRI, even after recovery. This enhancement reflects a prolonged breakdown of the blood-nerve barrier during nerve healing.
Area of Science:
- Neurology
- Radiology
- Pathology
Context:
- Inflammatory peripheral facial nerve palsy is a common neurological condition.
- Magnetic Resonance Imaging (MRI) is crucial for diagnosing facial nerve disorders.
- Understanding the imaging characteristics of facial nerve palsy is essential for patient management.
Purpose:
- To describe the characteristic MRI findings in inflammatory peripheral facial nerve palsy.
- To investigate the temporal course and correlation of MRI findings with clinical and electrophysiological data.
- To elucidate the underlying pathophysiology of observed MRI changes.
Summary:
- T1-weighted MRI sequences consistently reveal intense, linear, smooth enhancement of the distal intrameatal facial nerve segment in inflammatory palsy.
- T2-weighted sequences may show thickening of this segment.
- Pathological enhancement persists for weeks to months, independent of clinical recovery or electrophysiological status, indicating a sustained blood-nerve barrier disruption due to degeneration and regeneration.
Impact:
- Provides detailed imaging biomarkers for inflammatory facial nerve palsy.
- Highlights the long-lasting nature of blood-nerve barrier breakdown in facial nerve regeneration.
- Offers insights into the pathophysiology of facial nerve recovery, aiding in prognosis and treatment strategies.
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