幕下胚胎发育不良性神经上皮肿瘤的MRI诊断  

MRI Diagnosis of Subtentorial Dysembryoplastic Neuroepithelial Tumor

作　　者：熊伟[1] 张雪林[1] 张静[1] 张兴华[2] 符波[3] 

机构地区：[1]南方医科大学南方医院影像中心,广东广州510515 [2]解放军316医院放射科 [3]南方医科大学南方医院病理科

出　　处：《实用放射学杂志》2011年第3期330-333,共4页Journal of Practical Radiology

摘　　要：目的 探讨幕下发生的胚胎发育不良性神经上皮肿瘤（DNT）的MRI表现特点,以提高对该病的诊断水平.方法 回顾性分析经手术病理证实的6例DNT的MRI表现,并与手术、病理相对照.全部病例均行MR平扫及增强扫描.结果 6例肿瘤分别位于小脑半球3例、小脑蚓部1例、四脑室底部1例,另1例同时累及小脑半球和小脑蚓部.多数肿瘤边界清晰,无或轻度瘤周水肿,T1WI呈低信号,T2WI呈高信号.肿瘤容易发生囊变,本组有4例出现囊变伴囊壁结节形成.增强扫描肿瘤实体部分强化明显,仅1例肿瘤呈轻度不均匀强化.结论 DNT的MRI表现有一定的特征性,有助于该病的术前正确诊断.Objective To study the imaging characteristics of subtentorial dysembryoplastic neuroepithelial tumors（DNT） ,so that to improve the diagnostic accuracy of which. Methods 6 patients with operatively and pathologically proved DNT were retrospectively reviewed in comparison with surgical findings and pathological appearances. All cases received underwent plain and contrast-en hanced MR imaging. Results The locations of the 6 tumors were in the cerebellar hemisphere（3 cases） ,cerebellar vermis（ 1 case}, base of the fourth ventricle（1 case}, and in both cerebeUar hemisphere and cerebellar vermis simultaneously（ 1 case）. Most of the tumors presented long T1 and long T2 signal intensity and showed well-demarcated margins with no surrounding vasogenic edema or slight edema. Cystic degeneration was common findings with tuberosity on capsule wall. Most of the tumors showed strong enhancement in parenchyma only 1 case presented lightly enhancement after injection of contrast medium. Conclusion The subetentorial DNTs are of certain imaging characteristics,which are helpful for preoperative diagnosis.

关 键 词：脑 神经上皮肿瘤 磁共振成像 

分 类 号：R739.41[医药卫生—肿瘤] R445.2[医药卫生—临床医学]