MRI联合MRS辅助立体定向放射治疗复发高级别胶质瘤的疗效观察

目的 评价磁共振波谱分析(MRS)辅助立体定向放射治疗(SRS)小范围复发高级别胶质瘤(HGG)的效果.方法 根据MRS辅助选择有明确病理诊断的HGG且直径小于3 cm患者54例,分核磁共振(MRI)常规定位组(26例)和MRI+ MRS组(28例).MRI常规定位组以增强病灶及周围短T1、长T2区为靶灶范围;MRI+MRS组则以肿瘤性增强病灶及周围Cho/NAA指数(CNI)≥1.6为靶灶范围.至少随访12个月,分析两组疗效.结果 MRI+MRS组与常规定位组比较,边缘剂量明显增加(19.46 Gy vs.13.58 Gy),靶灶平均直径更小(2.6 cm vs.3.0 cm),无进展生存期更长(6.8个月 vs.5.6个月),1年生存率更高(78.6％ vs.50.0％),而脑水肿发生情况明显下降(5例 vs.17例),差异有统计学意义(P＜0.05).结论 MRI+ MRS辅助SRS有助于精确确定HGG范围,近期疗效好.

The effect of stereotactic radiosurgery treatment for recurrent high grade glioma with MRI and MRS

Objective To evaluate the effect of MRS-assisted stereotactic radiosurgery (SRS) for small recurrent high grade glioma (HGG).Methods A total of 54 patients with recurrent HGG were selected,the tumor diameter was less than 3 cm,the patients were divided into the conventional MRI group of 26 cases,and MRI+MRS group of 28 cases.The target region of the conventional MRI group was defined as the enhanced and short T1,long T2 area;MRI+MRS group was defined as the region of Cho/NAAindex (CNI) ≥1.6 in the surrounding short T1,long T2 and enhanced area.All the patients were followed up at least 12 months,analysed their therapeutic effect.Results Compared with the conventional MRI group,MRS+MRI group margin dose increased (19.46 Gy vs.13.58 Gy),the average diameter of target were smaller (2.6 cm vs.3.0 cm),progression-free survival was longer (6.8 months vs.5.6 months),the 1-year survival rate was higher (78.6％ vs.50.0％),and the occurrence rate of brain edema was lower (5 vs.17),the difference was statistically significant (P＜0.05).Conclusion MRI+-MRS assisted SRS helps to accurately identify the scope of HGG,its short term effect was superior.