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Case Reports
. 2021 Aug 26;16(11):3300-3303.
doi: 10.1016/j.radcr.2021.07.080. eCollection 2021 Nov.

Intraosseous metaplastic meningioma: A case report

Yusuke Utsunomiya  1 , Nobuyuki Mori  1 , Yuya Matsui  2 , Hiroki Katsushima  3 , Kenji Hashimoto  2 , Akihiro Furuta  1
Affiliations
Case Reports

Intraosseous metaplastic meningioma: A case report

Yusuke Utsunomiya et al. Radiol Case Rep. .

Erratum in

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.

Keywords: Calvarial; Imaging; Intraosseous; Meningioma; Metaplastic.

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Figures

Fig. 1 –
Fig. 1
Head computed tomography of a 65-year-old male presenting with headache. Axial (A, B) and coronal (C) images show a 19-mm-long, well-defined, left parietal bone mass near the squamosal suture. The main part of the mass is located in a diploic space, and the trabeculae are sparse but well preserved. There is also a mild bony bulge, although there are no tears in the inner or outer plates.
Fig. 2 –
Fig. 2
Magnetic resonance images of the mass. Axial T1-weighted image (A) shows the mass is isointense relative to muscles and includes internal hyperintense dots. Axial T2-weighted image (B) shows heterogeneous intensity. Axial diffusion-weighted image (C) and the corresponding apparent diffusion coefficient map (D) show diffusion restriction.
Fig. 3 –
Fig. 3
Histopathological examination of the mass reveals tumor growth in the intertrabecular space and whorl patterns of spindle-shaped cells (hematoxylin-eosin stain, original magnification, ×4 [A] and ×20 [B]). The tumor is marked with ossification (arrow) and lipomatous tissue (dashed arrow) inclusions, which are different from the pre-existing bone trabeculae and bone marrow fat. Immunohistochemistry shows that the tumor cells express epithelial membrane antigen (C) and progesterone receptor (D), but they are negative for MIB-1 (not shown here). Given these findings, the final diagnosis is intraosseous metaplastic meningioma (World Health Organization Grade I).
See this image and copyright information in PMC

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