Objective To investigate the clinical effectiveness of gamma knife and microsurgery operation for the treatment of bilateral parasagittal meningiomas.Methods Twenty-six patients with bilateral parasagittal meningiomas were operated by microscopy,and the most parts of the tumor was removed.The remains of the tumor were treated with gamma knife.Results All patients were followed up 5 years.The tumors disappeared in 8 cases,reduced in 11 cases,did not change in 5 cases,and recurred in 2 cases.No severe complications occurred after gamma knife treatment.Conclusion Combined treatment of gamma knife and micriosurgery operation are effective for bialateral parasagittal meningiomas.It not only greatly improves the effectiveness,but also reduces the complications and death rate in patients with bilateral parasagittal meningiomas.

Objective To explore the impact and value of 11C-MET PET/CT for high-grade glioma in making conformal radiotherapeutic planning compared with MRI.Methods From October 2011 to September 2013,11C-MET PET/CT and MRI were performed in 25 initial glioma cases and 9 recurrent cases.All 34 cases (19 males,15 females) were classified into initial group (n=17),initial surgery group (n=8) and recurrent group (n=9).GTV was outlined using PET/CT images combined with T1 weighted MRI images.Results 11 C-MET PET/CT optimized radiotherapy targets in 22 cases,including 7 initial cases,8 initial surgery cases and 7 recurrent cases.GTV was consistent with the volume of abnormally enhanced region on T1 weighted MRI (VMRI) in 10 initial cases,GTV＞VMRI in 5 cases,and GTV＜VMRI in 2 cases.GTV＜VMR1 in the initial surgery group.GTV was consistent with VMRI in 2 recurrent cases,GTV＞VMRI in 2 cases and GTV＜VMRI in 4 cases; 1 recurrent case's GTV located largely outside the VMRI.Conclusions There are some differences on locating the lesions of high-grade gliomas between 11C-MET PET/CT and MRI.Using 11CMET PET/CT in sketching radiotherapy target could significantly optimize the high grade glioma's radiotherapeutic planning,which may be more valuable in recurrent or operative cases.