CONCLUSION MRI allows us to predict better the arachnoid cyst in sacral canal, and the cyst seems to arise as a result of congenital defect of thecal dura.是什么意思_CONCLUSION MRI allows us to predict better the arachnoid cyst in sacral canal, and the cyst seems to arise as a result of congenital defect of thecal dura.在线翻译_英语_读音_用法_例句