嗅沟脑膜瘤的影像特征及鉴别诊断

目的：探讨嗅沟脑膜瘤的影像学表现与病理组织学之间的相关关系及其鉴别诊断。方法：对11例经手术及病理证实为嗅沟脑膜瘤的患者进行回顾性分析。男5例,女6例,年龄29～59岁,平均48岁。行CT检查3例,MRI检查8例,均为增强扫描。分析CT、MRI影像特征,并与手术、病理结果对照。结果：瘤灶起源于颅前窝嗅沟,多数密度或信号均匀,边界清楚,均匀增强;少数不均匀增强,大部分病例出现脑膜尾征,少数伴钙化、坏死、囊变。邻近颅骨受累时引起骨质增生或受侵。结论：起源于嗅沟的脑膜瘤均具有典型的影像学表现特征。嗅沟骨质及其脑膜影像改变的显示,对瘤灶起源具有重要的定位、定性诊断价值。MRI优于CT,但CT对钙化和骨质改变显示优于MRI。

Imaging Findings and Differential Diagnosis of Olfactory Groove Meningiomas

Objective： To study the relationship between imaging findings on CT or MRI and pathological features of the olfactory groove meningiomas and differential diagnosis.Methods： Eleven patients（5 males and 6 females,29 – 59 years old with an average of 48） with surgically and pathologically certificated olfactory groove meningiomas were examined by CT or MRI.All patients were examined by MRI（8 patients） or CT（3 patients） with enhanced scan.The imaging features and pathological findings were compared.Results： Most of the meningiomas had uniform density or intensity with homogeneous enhancement.Some had inhomogeneous enhancement and dural tail sign.A few meningiomas had calcification,cyst and necrosis.The neighbouring bone of the tumor was involved in only one case.Conclusion： The olfactory groove meningiomas have typical imaging features.Meninges and bone changes in olfactory groove area are valuable feature signs for location and qualitation in diagnosis.MRI is much better than CT,but CT is superior to MRI in detecting calcification in tumor and bone involvement.