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Intraosseous metaplastic meningioma: A case report
Yusuke Utsunomiya1, Nobuyuki Mori1, Yuya Matsui2
1Department of Radiology, Osaka Red Cross Hospital, 5-30, Fudegasakicho, Tennoji-ku, Osaka 543-8555, Japan.
Abstract:
Metaplastic meningioma is a rare World Health Organization Grade I meningioma subtype, accounting for 0.2%-1.6% of all meningiomas. Primary extradural meningiomas represent less than 2% of all meningiomas, with intraosseous meningioma as a subtype of primary extradural meningiomas. Herein, we report the case of a 65-year-old male presenting with headache. His computed tomography scans showed an osteolytic left parietal bone mass, and magnetic resonance imaging revealed hyperintense dots in the mass on T1-weighted images. The mass was then resected and diagnosed on histopathological examination as an intraosseous metaplastic meningioma.
Insights
We report a rare case of intraosseous metaplastic meningioma, a World Health Organization Grade I subtype. This extradural meningioma presented as an osteolytic skull mass in a 65-year-old male patient.
Area of Science:
- Neurosurgery
- Oncology
- Pathology
Background:
- Metaplastic meningioma is a rare World Health Organization (WHO) Grade I subtype, comprising 0.2%-1.6% of all meningiomas.
- Primary extradural meningiomas are infrequent, accounting for less than 2% of all meningiomas.
- Intraosseous meningioma is a specific subtype of primary extradural meningiomas, originating within the bone.
Observation:
- A 65-year-old male presented with headache and an osteolytic left parietal bone mass detected via computed tomography (CT).
- Magnetic resonance imaging (MRI) revealed characteristic hyperintense dots within the mass on T1-weighted images, suggesting a specific tissue composition.
Findings:
- The resected skull mass was histopathologically confirmed as an intraosseous metaplastic meningioma.
- This diagnosis represents a rare confluence of meningioma subtype (metaplastic) and location (intraosseous).
Implications:
- This case highlights the importance of considering rare meningioma subtypes in the differential diagnosis of osteolytic skull lesions.
- Accurate histopathological diagnosis is crucial for appropriate management and understanding the behavior of these uncommon tumors.
- Further research into metaplastic and intraosseous meningiomas may elucidate their uniquePathogenesis and inform treatment strategies.
