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FIG 5. 52-year-old woman with meningioma located in the left prepontine cistern.
A, T1-weighted image shows a well-demarcated, strongly enhanced extraaxial mass.
B, ADC map shows that the tumor (1) has slightly higher signal intensity than that of adjacent brain parenchyma. ADC value of 109 x 10-3 mm2/s does not help to distinguish this tumor from other benign lesions.
C, MR spectrum shows decreased NAA/Cho ratio (0.76) with prominent lipid and alanin peaks at 1.5 ppm (alanin/Cr = 0.68). Prominent alanin peak with low NAA and high Cho levels helps to distinguish meningioma from other tumor groups.
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