颅内单发转移瘤的磁共振成像的影像表现

目的：探讨颅内单发转移瘤的磁共振成像（MRI）表现，进一步提高影像诊断的准确性，指导临床的下一步治疗。方法回顾性分析我院就诊20例颅内单发转移瘤患者，采用T1WI、T2WI平扫、增强扫描以及功能MRI，对所有患者进行影像学检查，观察瘤体的MRI表现。结果20例颅内转移瘤均为单发病例，幕上17例，幕下3例。 MRI表现囊实性和实性，囊实性病变14例，实性部分呈稍长T1稍长T2信号，FLAIR呈稍高信号，囊性部分呈长T1长T2信号或短T1长T2信号，FLAIR序列呈高信号，实性部分及囊壁呈不规则环形强化。囊性病变有5例，囊壁呈等信号，囊内呈长T1长T2信号，FLAIR序列呈高信号，囊壁明显强化。单体素磁共振频谱（MRS）检查：未见N-乙酰天门冬氨酸（NAA）峰，胆碱（Cho）峰明显升高。磁共振扩散加权成像（DWI）检查的病例病灶均以囊性为主，囊壁弥散稍受限，囊内弥散不受限，表观扩散系数（ADC）图囊壁呈等信号，囊内呈高信号。结论颅内单发转移瘤的MRI表现有其相对特征性，在结合病史及功能磁共振检查，可较大提高其诊断准确率，为临床下一步治疗提供良好的帮助。

Imaging of single magnetic resonance imaging metastasis of intracranial manifestation

Objective To investigate MRI manifestation of the intracranial tumor, to further improve the accu-racy of imaging diagnosis, to guide the clinical treatment. Methods Retrospectively analysed 20 cases of intracranial metastatic tumor patients in our hospital, using T1WI, T2WI plain scan, enhanced scan and functional MRI, all the pa-tients underwent imaging examination, and observed the MRI manifestations of tumor. Results Twenty cases of in-tracranial metastases were solitary cases, 17 cases of supratentorial, infratentorial in 3 cases.MRI findings of cystic and solid, cystic lesions in 14 cases, the solid part showed slightly long T1 and long T2 signal, FLAIR showed slightly high-er signal, cystic part was long T1 and long T2 signal or short T1 and long T2 signal, FLAIR sequence showed high sig-nal, the solid part and cystic wall was not the rules of annular enhancement. Cystic lesions in 5 cases, cystic wall was equal signal, a long T1 and long T2 signal cyst, FLAIR sequence showed high signal, the cyst wall was enhanced. Sin-gle voxel MRS showed： no NAA peak, Cho peak increased significantly. DWI examination of the patients were pre-dominantly cystic lesions, cystic wall diffusion limited, sac dispersion was not limited, ADC sabretache wall was of e-qual signal, showing high signal capsule. Conclusion MR features of intracranial solitary metastases has its relative characteristics, in combination with the history and functional MRI, it can improve the accuracy rate of diagnosis, pro-viding a good help for the clinical treatment.