PMC4898224_01
49-year-old woman with meningioma. A. Axial T1-weighted MRI image demonstrates a mass isointense to cerebral cortex involving the left cerebellopontine angle. B. Axial T2-weighted MRI image at the same level shows the mass is intermediate high-signal-intensity (higher then cerebral cortex but less than CSF). There is mass effect on the 4th ventricle and the pons without edema.
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T1 and intermediate-high signal on T2 (Fig. 1). There was homogeneous enhancement with a small dural tail and extension into the left internal auditory canal (Fig. 2), as well as extension into Meckel's cave anteriorly and the jugular foramen inferiorly (Fig. 3).
49-year-old woman with meningioma. Axial (A) and coronal (B) T1-weighted fat-suppressed postgadolinium MRI images show avid, homogeneous enhancement of the mass. There is a small dural tail (black arrow) and extension into the left IAC via the porus acousticus (white arrow). The IAC is not dilated. Mass effect is again seen on the pons, middle cerebellar peduncle, and 4th ventricle.
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T1 and intermediate-high signal on T2 (Fig. 1). There was homogeneous enhancement with a small dural tail and extension into the left internal auditory canal (Fig. 2), as well as extension into Meckel's cave anteriorly and the jugular foramen inferiorly (Fig. 3).
49-year-old woman with meningioma. A. Axial DWI shows hyperintensity of the mass in the left CPA. B. Axial ADC image at the same level shows relatively low ADC values near those of adjacent parenchyma. Mass effect on the midbrain and 4th ventricle is seen again.
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Diffusion-weighted imaging showed mildly elevated DWI signal with relatively low ADC values near those of adjacent parenchyma (Fig. 4).
49-year-old woman with meningioma. Coronal T1-weighted postgadolinium MRI shows enhancement of the left CPA mass. Mass effect is seen on the pons, with inferior herniation of the cerebellar tonsils into the foramen magnum.
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There was downward tonsillar herniation through the foramen magnum (Fig. 5).
49-year-old woman with meningioma. Axial CT in (A) bone window and (B) soft-tissue window shows subtle hyperostosis of the left petrous ridge at the porus acousticus (black arrow) and coarse calcification (white arrows) anteriorly within the mass.
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CT obtained for surgical planning showed mild hyperostosis of the adjacent petrous ridge, with dense calcification of the anterior portion of the mass (Fig. 6).