Avoidance of hemodynamic fluctuations in the heart rate and or the blood pressure perioperatively, rapid postoperative recovery, and adequate postoperative pain relief are some of the important goals of neurosurgical anesthesia. Scalp block in association with general anesthesia is used to achieve these goals. Previous studies have been published related to the effect of scalp block on the perioperative outcomes on the craniotomy patients. The results reported so far are controversial and one cannot at this point define a positive effect for post-operative pain relief. This disparity in results may be the consequences of the size of the patient population. However scalp block is an accepted practice in the craniotomy patients. The investigators believe this is the first study which assesses the effectiveness of scalp block for asleep craniotomy with the largest sample size study so far conducted in the literature related to this topic. The aim of this study is to assess the effectiveness of scalp block for the perioperative comfort of the craniotomy patients undergoing resection for supratentorial tumors.