Tumor size often differs between study groups. The post-treatment QOL outcome could be influenced by the doctor’s social and surgical skills as well as by recurrent tumor growth after GKRS or MS. In general, each selection bias or comorbidity difference between different groups makes comparison of these groups questionable [11]. Despite these drawbacks, we think it is useful to take note of some other studies, which used the same questionnaires, as they put our findings in perspective.