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The magnetic resonance(MR)findings in 50 surgically verified intracranial meningiomas were reviewed.An attempt was made to correlate their signal intensity on spin echo(SE)T1-weighted,proton density[N(H)],and T2-weighted images with the different histologic subtypes.The T1-weighted images were nonspecific in differentiating the subtypes of meningiomas.On proton density and T2-weighted images,more information was available,but there remained large group(46%)of meningiomas that were not classifiable.The average signal intensity scores on T1-weighted,proton density,and T2- weighted images in the different histologic subtypes were correlated with each other using the Student t test.Only one significant correlation (psammomatous-anaplastic)and three almost significant correlations (syncytial-transitional or psammomatous and transitional-psammomatous)were found.Different histologic subtypes may have a different MR appearance,but this does not suffice to reach a histologic diagnosis by MR imaging. |
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