脊索样脑膜瘤的MRI诊断  

MRI Diagnosis of Chordoid Meningioma

作　　者：范琴 易自生 郭美琴 陈蕾蕾 李倩 FAN Qin;YI Zi-sheng;GUO Mei-qin;CHEN Lei-lei;Li Qian(Department of Radiology,the 907th Hospital of the Joint Logistic Support Force of the PLA,Nanping 353000,Fujian Province,China;Department of Radiology,the 900th Hospital of the Joint Logistic Support Force of the PLA,Fuzhou 350025,Fujian Province,China)

机构地区：[1]联勤保障部队第九〇七医院放射诊断科,福建南平353000 [2]联勤保障部队第九〇〇医院放射诊断科,福建福州350025

出　　处：《中国CT和MRI杂志》2024年第6期10-11,共2页Chinese Journal of CT and MRI

摘　　要：目的 探讨脊索样脑膜瘤的MRI影像学特点,提高其术前诊断准确率。方法 回顾性分析7例均经手术病理证实的脊索样脑膜瘤MRI影像学表现。结果 肿瘤位于大脑凸面及中后颅窝各2例,大脑镰旁、侧脑室前角及鞍区各1例。7例均呈T_(1)WI呈低信号、T_(2)WI呈高信号,其中3例肿瘤内信号不均匀。7例DWI等低信号,ADC值范围0.757×10^(-3)mm^(2)/s~1.693×10^(-3)mm^(2)/s。6例NADC (标准化ADC)值范围1.52~2.23,1例为1.27。4例全瘤均匀显著强化,3例强化不均匀,3例见脑膜尾征。包绕垂体柄、瘤周脑实质侵犯、瘤周神经受侵及瘤周水肿各1例。结论脊索样脑膜瘤除具有脑膜瘤的基本MRI影像特点外,同时具有其它较特征性表现,主要表现在T_(1)WI呈低信号,T_(2)WI上呈高信号,DWI不受限,NADC大于1.5,增强扫描肿瘤实质显著强化。Objective To investigate the MRI imaging features of chordoid meningioma and improve the preoperative diagnostic accuracy.Methods MRI imaging findings of 7 cases of chordoid meningioma confirmed by operation and pathology were retrospectively analyzed.Results The tumors were located in the convex side of the brain,in the middle and posterior fossa of the brain in 2 cases,beside the falx of the brain,in the anterior horn of the lateral ventricle and in the sellar region in 1 case.All the 7 cases showed low signal on T_(1WI) and high signal on T_2WI,and 3 of them showed uneven signal in tumor.7 cases of equal low signal in DWI,ADC value was 0.757×10^(-3)mm^(2)/s~1.693×10^(-3)mm^(2)/s.The NADC(nomalized ADC) values in 6 cases ranged from 1.52 to 2.23,1.27 in 1 case.Uniform and significant enhancement was observed in 4 cases,uneven enhancement in 3 cases,and meningococcal tail sign in 3 cases.There were 1 case of wrapped pituitary stalk,peritumoral brain parenchyma invasion,peritumoral nerve invasion and peritumoral edema.Conclusion In addition to the basic MRI features of meningioma,chordoid meningioma also has other characteristic features,including low signal on T_1WI,high signal on T_2WI,unrestricted DWI,NADC greater than 1.5,and significant enhancement of tumor parenchyma on enhanced scan.

关 键 词：脊索样脑膜瘤 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学]