Tomotherapy for Leptomeningeal Metastases

Inclusion Criteria: * Histologic or cytologic diagnosis of primary tumor and conformed meningeal metastases by enhanced MRI; KPS ≥60,or KPS ≥40 and the limitation of motion is simply caused by brain tumor that is adjacent to the motor function areas; Age: 18-75 years old; Adequate organ function:WBC≥4.0x109/L Neu ≥ 1.5x109/L Hemoglobin ≥ 110 g/L Platelets ≥100 x109/L Total bilirubin ≤ 1.5x ULN AST and ALT ≤ 1.5x ULN BUN and Cr: within the normal range. Exclusion Criteria: * Other clinically significant diseases (e.g.myocardial infarction within the past 6 months, severe arrhythmia); unable or unwilling to comply with the study protocol; patients who are anticipated in other clinical trials of meningeal metastases; pregnant patients or female patients whose HCG is positive; unsuitable to participate in study, that in the opinion of the treating physician.