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Primary ectopic meningioma of the neck: MR features
D Tampieri1, R Pokrupa, D Melanson
1Department of Radiology, Montreal Neurological Hospital and Institute, McGill University, Quebec, Canada.
Abstract:
Although meningiomas represent 15% of the tumors of the CNS, primary ectopic meningioma is a very rare finding. Four mechanisms for the formation of ectopic meningioma have been suggested: (a) direct extension of an intracranial lesion; (b) distant metastasis from an intracranial meningioma; (c) origin from arachnoid cells within the sheaths of cranial nerves; and (d) origin from embryonic nests of arachnoid cells. The case we present underwent a complete neuroradiological screening, and, although the neuroradiological findings were nonspecific to provide a correct diagnosis, they were useful for assessment of the tumor extension and for surgical planning. Particularly, magnetic resonance gave a panoramic view of the tumor and suggested its extensive vascularization, which was confirmed later by angiography.
Insights
Primary ectopic meningioma, a rare central nervous system (CNS) tumor, was investigated. Neuroradiological screening aided in assessing tumor extent and surgical planning for this unusual case.
Area of Science:
- Neurology
- Neurosurgery
- Oncology
Background:
- Meningiomas constitute 15% of central nervous system (CNS) tumors.
- Primary ectopic meningioma is an exceptionally rare clinical finding.
- Ectopic meningiomas may arise from various proposed mechanisms, including direct extension, metastasis, or nests of arachnoid cells.
Observation:
- A case of primary ectopic meningioma underwent comprehensive neuroradiological evaluation.
- While findings were nonspecific for definitive diagnosis, they were crucial for surgical planning.
- Magnetic resonance imaging provided a detailed view of tumor extent and vascularity.
Findings:
- Neuroradiological screening, particularly MRI, offered insights into tumor characteristics.
- Angiography confirmed extensive tumor vascularization suggested by MRI.
- The study highlights the utility of advanced imaging in managing rare CNS tumors.
Implications:
- Accurate tumor assessment through advanced imaging is vital for surgical planning in rare cases.
- Understanding the vascularity of ectopic meningiomas aids in preoperative strategies.
- This case contributes to the limited literature on primary ectopic meningiomas and their management.