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Imaging investigations of optic gliomas
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 7
- DOI:
- 10.3760/j.issn:1005-1201.2004.07.001
- Key Word:
- 视神经胶质瘤;体层摄影术,X线计算机;磁共振成像
Abstract： 目的研究视神经胶质瘤的CT和MRI表现及其诊断价值.方法20例视神经胶质瘤均经手术病理证实,男10例,女10例,年龄8个月至69岁.10例行CT扫描,19例行MR扫描.结果20例中12例视神经呈梭形,5例呈管形增粗,2例呈哑铃形,1例呈椭圆形.20例均累及视神经眶内段和管内段,其中16例累及颅内段,4例累及球内段,6例累及视交叉,2例累及视束.行CT扫描的10例均为等密度,行增强扫描的2例均强化.行MR扫描的19例中,12例呈长T1、长T2信号,5例呈长T1、等T2信号,2例呈等T1、等T2信号.行MR增强扫描的14例中,12例呈明显强化,2例呈中度强化.在伴有神经纤维瘤病Ⅰ型的7例中,4例有特异性表现,即中心呈等T1、等T2信号,周边部分呈长T1、长T2信号,中间部分在T1WI和T2WI均为低信号.经统计学处理,MRI显示肿瘤累及视神经管内段和颅内段明显优于CT(P＜0.01).结论CT和MRI能显示肿瘤的部位、形态和内部特征,可明确诊断,有助于制定治疗方案和手术方案;MRI在定位诊断和定性诊断方面优于CT.
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