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恶性脑膜瘤生长速度快,具有明显侵袭性、术后容易复发及转移等特点。T1加权像均呈不规则混杂信号,以等低信号为多见,T2加权像以高等混杂信号为多见。增强扫描,肿瘤大多呈显著强化,且以不均匀强化常见,可出现囊变、坏死、出血信号。肿瘤形态多不规则,呈分叶状。“脑膜尾征”多表现为粗、短及不规则。可侵蚀、破坏相邻的颅骨,甚至可形成软组织肿物跨颅内外生长。脑膜瘤磁共振波谱Cho/Cr比值对脑膜瘤良、恶性鉴别诊断具有重要价值,MR PWl的rCBV值是评价脑膜瘤良恶性的有价值的指标,对指导临床选择正确的治疗方案及评估预后具有重要意义。常规MRI结ADC值的变化能明显提高对于良恶性脑膜瘤的鉴别诊断。现对其研究进展进行综述。
Malignant meningioma grows fast, with obvious invasive, easy to recurrence and metastasis and so on. T1-weighted images were irregular mixed signal to low signal is more common, T2-weighted image to more common high-level mixed signals. Enhanced scan, most of the tumor was significantly enhanced, and to enhance the common heterogeneity, there may be cystic degeneration, necrosis, bleeding signal. More irregular tumor morphology was lobulated. “Meningeal sign ” more performance for the rough, short and irregular. Can erode, destroy the adjacent skull, and even the formation of soft tissue tumors across the growth of intracranial. The MR / Cho ratio of meningiomas is of great value in the differential diagnosis of benign and malignant meningiomas. The rCBV of MR PWl is a valuable index to evaluate the benign and malignant meningiomas. It is of great value in guiding the clinical choice of the correct treatment and prognosis Significance. The change of ADC value in conventional MRI can obviously improve the differential diagnosis of benign and malignant meningioma. Now summarize the research progress.