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Intralabyrinthine schwannomas: imaging diagnosis and classification
K L Salzman1, A M Childs, H C Davidson
1Department of Radiology, University of Utah, Salt Lake City, 84132-2140, USA. Karen.salzman@hsc.utah.edu
AJNR. American Journal of Neuroradiology
|December 14, 2011
Summary
Intralabyrinthine schwannomas (ILS) are rare inner ear tumors. This study proposes an anatomy-based classification system to improve ILS description and management, aiding surgeons and radiologists.
Area of Science:
- Neuro-oncology
- Radiology
- Otolaryngology
Background:
- Intralabyrinthine schwannomas (ILS) are rare, distinct from acoustic schwannomas.
- Fewer than 137 cases reported, necessitating standardized classification.
- Accurate ILS localization is crucial for treatment and prognosis.
Purpose of the Study:
- To present a novel classification scheme for ILS based on labyrinthine anatomy.
- To facilitate precise description and localization of ILS.
- To aid otolaryngologists and radiologists in ILS management.
Main Methods:
- Retrospective analysis of 45 ILS patients (1996-2010).
- High-resolution T2 and contrast-enhanced MRI utilized.
- Clinical and imaging data were collected and analyzed.
Main Results:
- Progressive sensorineural hearing loss was the most common symptom.
- Lesion locations: Intracochlear (14/45), Transmodiolar (13/45), Intravestibular (7/45), Vestibulocochlear (5/45), Transmacular (4/45), Transotic (2/45).
- 16 patients underwent surgery; others were monitored via MRI.
Conclusions:
- ILS are uncommon but under-reported inner ear tumors.
- High-resolution MRI effectively characterizes ILS.
- Anatomically based classification aids radiologic description and surgical planning for ILS.
