联合MRI和CT诊断微小脑膜瘤

目的 探讨微小脑膜瘤CT和MRI早期敏感征象,提高其检出率.方法 回顾性分析41例经临床随访及病理确诊为微小脑膜瘤的临床及影像学资料,观察并记录微小脑膜瘤发生部位、CT密度、MRI信号特点,对结果进行统计学分析.结果 21例患者行CT平扫检查,其中5例呈钙化密度,12例呈高/稍高密度,4例呈等密度.41例患者均行MRI检查,T1 WI:37例呈等信号,4例呈低信号;T2 WI:33例呈等信号,4例呈高信号,4例呈低信号;FLAIR:14例呈略高信号,27例呈等信号.13例患者行扩散加权成像(DWI)检查,其中5例呈高/稍高信号.MR增强扫描病变均呈明显强化.结论 MR多序列(FLAIR、DWI)、多方位(矢状面)结合增强扫描、薄层扫描并联合CT平扫可极大地减少微小脑膜瘤的漏诊率.

Combination of MRI and CT in the diagnosis of micro meningioma

Objective To investigate the early sensitive signs of the micro meningioma using CT and MRI and to improve the detection rate. Methods A retrospective analysis of the clinical and imaging data of 41 patients with micro meningioma was conducted,who were diagnosed by clinical following-up and pathological results.The position and the features of CT and MRI of the intracranial meningiomas were calculated and analyzed.Results Of the 21 patients with micro meningioma who underwent CT scan,5 cases presented calcification density,12 cases showed high or slightly high density,4 cases showed isodensity.All participants were underwent MRI.Among of them,37 cases with isointensity and 4 cases with hypointensity on T1 WI;On T2 WI,33 cases with isointensity,4 cases with hyperintensity and 4 cases with hypointensity;and 14 cases with slight hyperintensity,27 cases with isointensity on FLAIR.Of the 13 micro meningioma who did DWI,5 cases with hyperintensity or slight hyperintensity.All lesions were obviously enhanced.Conclusion Multimodal MRI (FLAIR,DWI ),enhanced scan and thin slice from different directions (sagittal plane),combined with CT may greatly reduce the omission diagnostic rate.