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Intracanalicular meningioma mimicking vestibular schwannoma
Katsuyuki Asaoka1, David M Barrs, John H Sampson
1Carolina Neuroscience Institute for Skull Base Surgery, 4030 Wake Forest Road, Suite 115, Raleigh, NC 27609, USA.
Summary:
Three cases of intracanalicular meningioma mimicking vestibular schwannoma are presented. In each case, a contrast-enhancing mass filling the internal auditory canal was identified on MR images and was originally diagnosed as a vestibular schwannoma. Although it is difficult to differentiate definitively between these lesions preoperatively, imaging findings inconsistent with a diagnosis of vestibular schwannoma can be identified. Preoperative identification of intracanalicular meningiomas permits alterations in surgical planning that allow for the more complete resection of these rare tumors.
Insights
Intracanalicular meningiomas can mimic vestibular schwannomas on MRI scans. Recognizing subtle imaging differences is crucial for accurate preoperative diagnosis and surgical planning of these rare tumors.
Area of Science:
- Neurosurgery
- Neuroradiology
- Oncology
Background:
- Vestibular schwannomas are common tumors of the internal auditory canal.
- Intracanalicular meningiomas are rare tumors that can present similarly.
Observation:
- Three cases of intracanalicular meningioma were initially misdiagnosed as vestibular schwannoma based on initial MRI.
- Contrast-enhancing masses filling the internal auditory canal were noted in all cases.
Findings:
- While challenging, specific imaging findings can suggest meningioma over schwannoma.
- Preoperative differentiation is possible, though difficult.
Implications:
- Accurate preoperative diagnosis of intracanalicular meningioma impacts surgical strategy.
- Improved surgical planning can lead to more complete resection of these rare tumors.