【摘要】 目的探讨囊性脑膜瘤的MRI特点,提高其诊断准确性。方法回顾分析经手术病理证实的6例囊性脑膜瘤的MRI表现。6例均行常规MRI检查,其中2例加做DWI及MRS。结果采用Nauta分型法,6例囊性脑膜瘤中Nauta Ⅰ型1例、Ⅱ型2例及Ⅳ型3例。术前1例Ⅱ型和1例Ⅳ型均误诊为胶质瘤,另4例确诊。6例发病部位均符合一般典型脑膜瘤特点,5例呈实质性肿块或结节伴大小不一的囊样区,1例Nauta Ⅱ型表现为巨大囊性区为主而瘤实质甚少,增强后肿瘤实质均有较明显强化,3例瘤外囊肿壁不强化,3例见脑膜尾征;2例囊性脑膜瘤囊液DWI均呈低信号,且瘤体实质部MRS未见明显NAA峰,但Cho峰明显升高。结论囊性脑膜瘤常规MRI表现具有一定特征性,结合MRS对确诊有一定帮助。更多还原

【Abstract】 Objective To study the MRI imaging features of cystic meningiomas and to arise the diagnostic accuracy. Methods 6 cases MRI data in cystic meningiomas confirmed by the operative and pathological results were analyzed retrospectively. All patients underwent the routine MRI, in which 2 cases performed DWI and MRS. Results The imaging type of cystic meningioma was divided by using Nauta. In 6 cases, one belonged to Nauta Ⅰ, 2 cases Nauta Ⅱ and 3 cases Nauta Ⅳ. One of Nauta Ⅱ and one of Nauta Ⅳ were all misdiagnosed as gliomas before operation and the others were accuratedly diagnosed. The location of lesion accorded with the common meningiomas occurred ones. 5 cases appeared the parenchymatous or nodular parts companying with the diverse cystic areas, one of Nauta Ⅱ showed the giant cyst companying with few parenchymatous part. The parenchymatous parts in all tumors had the marked enhancement and the cystic wall outside tumors in 3 cases non-enhancement. The meningeal tail sign was seen in 3 cases. The cystic fluid areas were hypointensity signals on DWI in 2 cases. NAA peak was not demonstrated and Cho peak appeared obviously high on MRS in 2 cases. Conclusion The MRI appearance in cystic meningiomas exists some characteristics.Combining MRS is very helpful in diagnosing of this disease.更多还原