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. 1999 May;20(5):882–885.

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fig 1. — 48-year-old man with a 2-month history of recurrent episodes of unsteady gait, visual loss, tinnitus, left arm paresthesia, and frontal headache.

A, Axial T2-weighted MR image shows an intraventricular meningioma in the right trigone (arrows) with heterogeneous signal, surrounded by edema. There are some enlarged vessels at the periphery of the mass (arrowheads).

B and C, Axial (B) and coronal (C) T1-weighted contrast-enhanced MR images show intense relatively homogeneous enhancement of the meningioma. Note contact with the choroid plexus (arrow, C) and posterior transtentorial herniation (arrowheads, C).

D, Axial T1-weighted MR image shows the position of the voxel for spectroscopy.

E, Localized proton MR spectrum (SE 2000/136/128) of the intraventricular meningioma shows a prominent resonance from Cho and a doublet centered at 1.47 ppm and inverted at this TE, which can be assigned to Ala.

F, Localized proton MR spectrum (SE 2000/31/128) shows a prominent resonance from Cho, a decrease in the Cr and NAA resonances, and the presence of lipids. Ala can also be assigned at this TE.