摘要
目的:探讨MRI在小儿四脑室区肿瘤中的诊断价值。材料与方法:18例经手术和病理证实的四脑室区肿瘤,采用GE Signa 1.5T MR扫描仪进行平扫及增强扫描,分析其MR图像特征及发病部位。结果:18例中髓母细胞瘤7例,星形细胞瘤7例,室管膜瘤3例,神经鞘瘤1例。肿瘤以T1WI低信号、T2WI高信号为主。髓母细胞瘤都来源于小脑蚓部,6例合并小囊变,1例合并少量出血,增强扫描均匀、明显强化。星形细胞瘤中5例来源于小脑蚓部和小脑半球;2例来源于脑干,有大囊变,呈半环形、环形强化,有强化壁结节;分化差者形状不规则,呈不规则厚壁强化,壁结节多。室管膜瘤2例来源于第四脑室,囊变较小;1例来源于小脑蚓部,有大囊变;信号混杂不均,注射Gd-DTPA后呈中等强化。神经鞘瘤来源于第四脑室,呈分叶状,下部有囊变,实质部分明显均匀强化,囊变区未见强化。结论:MR对小儿四脑室区肿瘤诊断及鉴别诊断具有重要价值。
Objective： To discuss the MRI diagnostic value of the fourth ventricular tumors in children. Materials and Methods： Eighteen cases of pediatric fourth ventricular tumors proved by surgery and pathology were reported. The routine and post-contrast images were obtained by a 1.5T MR scanner. Results： There were 7 medulloblastomas, 7 astroeytomas, 3 ependymomas, and 1 schwannoma. Most tumors demonstrated as low signal intensity on T1WI and high signal intensity on T2WI. Medulloblastomas originated from cerebellar vermis. Six of them had small cysts and one of them had bleeding within the tumor. They all enhanced strongly. Five astrocytomas originated from cerebellar vermis and one from brain stem. Most of them had big cysts with semi-rim like circular enhancement or rim-like circular enhancement. Enhanced nodules can also be seen. The poor differentiated ones were irregular in shape with more nodules. Two ependymomas originated from fourth ventricle with small cysts inside. One ependymoma originated from cerebellar vermis with big cyst formation. One schwannoma originated from fourth ventricle. The upper part enhanced strongly and lower part was a big cyst without enhancement. Conclusion： MR examination is very useful in the assessment of pediatric fourth ventricular tumors.
出处
《中国临床医学影像杂志》
CAS
北大核心
2008年第4期229-231,共3页
Journal of China Clinic Medical Imaging
关键词
脑肿瘤
磁共振成像
Brain neoplasms
Magnetic resonance imaging
