J Korean Soc Radiol.  2011 May;64(5):429-434. 10.3348/jksr.2011.64.5.429.

Angiomatous Meningioma: CT and MR Imaging Features

• An HY
• Yu IK
• Kim MS
• Kim SM
• Kim HK

• KMID: 2040809
• DOI: http://doi.org/10.3348/jksr.2011.64.5.429

Abstract

PURPOSE
To describe the computed tomography and magnetic resonance imaging features of angiomatous meningiomas.
MATERIALS AND METHODS
We reviewed the imaging findings of six patients with pathologically proven angiomatous meningiomas and characterized the location, margin, dura base, CT attenuation, MR signal intensity, intratumoral signal void, contrast enhancement, intratumoral cystic change, and peritumoral edema.
RESULTS
Most tumors showed high signal intensity on T2-weighted images, and low signal intensity on diffusion-weighted images. After intravenous contrast administration, the tumor showed heterogeneous strong enhancement. Most tumors had a lobulated margin with prominent intratumoral signal voids. Four patients showed marked or small intratumoral cystic changes.
CONCLUSION
Typically, angiomatous meningiomas were dura-based masses characterized by lobulated margins with high signal intensity on T2-weighted imaging (T2WI), low signal intensity on diffusion-weighted imaging (DWI), prominent intratumoral signal voids, intratumoral cystic changes, and marked enhancement after intravenous contrast administration.

MeSH Terms

Humans
Magnetic Resonance Imaging
Meningioma
Tomography, X-Ray Computed

Figure

• 

  Fig. 1 A, B. Precontrast (A) and contrast-enhanced (B) CT images reveal irregular, lobulated margins in the low-attenuated mass (arrows) with heterogeneous enhancement and intratumoral irregular cystic changes (arrows). C, D. Axial MR images reveal the relatively narrow dura-based, lobulated mass (arrows), showing heterogeneous high signal intensity on T2WI (C) and heterogeneous enhancement on post-contrast T1WI (D). E. Photograph of the excision biopsy specimen showing a highly vascular tumor predominantly consisting of dilated vascular spaces with intervening areas with spindle and oval cells as well as abundant cytoplasm and oval vesicular nuclei (H & E, × 400).

• 

  Fig. 2 A, B. Precontrast (A) and post-contrast (B) CT images reveal the lobulated low-attenuated mass (arrows) with marked enhancement and multiple cystic changes (arrowheads). C-E. MR images reveal the lobulated mass (arrows) with multiple cystic changes (arrowheads) showing high signal intensity on T2WI (C), slightly low signal intensity on DWI (D), and marked enhancement with prominent intratumoral vascularities on post-contrast T1WI (E). F. Perfusion MRI shows markedly increased rCBV in the tumor (arrows).

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