颅内脑膜瘤的MR影像特点

CHARACTERISTICS OF MAGNETIC RESONANCE IMAGING IN INTRACRANIAL MENINGIOMAS

分析６７例颅内脑膜瘤的信号变化，发现７０％的脑膜瘤其信号变化和脑灰质信号变化同步，１９．４％的脑膜瘤信号随着回波时间的延长而升高，１０．４％的脑膜瘤信号在Ｔ２加权为混杂信号。同时，得出磁共振成像（ＭＲＩ）对脑膜瘤的正确诊断率达９２．５％，脑膜瘤被ＭＲＩ误诊为其它肿瘤的为７．５％，其它肿瘤被ＭＲＩ误诊为脑膜瘤的为４．６％，并探讨了ＭＲＩ的误诊原因及误诊病变的好发部位。

he magnetic resonance imaging(MRI)signal change of the intracranial meningiomas was analyzed in 67 cases. It was found that:(l)70%meningiomas displayed changes of homogeneous signal similar to that of gray matter;(2)19. 4%meningiomas signal increased with Prolonged spin echo time;(3)10. 4%meningiomas exhibited mixed signal in T2Wl.The correct diagnosis rate with MRI was 92.54%,the misdiagnostic rate of meningiomas for other tumours 7.46%and the misdiagnostic rate of other tumours for meningiomas 4.62%.Causes of misdiagnosis and the frequent position of misdiagnostic tumours were discussed.