Anterior scalp block with 0.5% plain Marcaine 20 ml. may reduce the intraoperative opioid consumption in neurosurgical patients who undergoing the supratentorial craniotomy compared to those who receive 0.9% normal saline solution (placebo).

Anterior scalp block with 0.5% plain Marcaine 20 ml. may reduce the intraoperative opioid consumption in neurosurgical patients who undergoing the supratentorial craniotomy compared to those who receive 0.9% normal saline solution (placebo).

A Prospective Randomized Double Blind Control

Inclusion Criteria:

1. Patients who have supratentorial brain tumor
2. Patients have been scheduled to undergo an elective craniotomy to remove tumor in any surgical position
3. Patients have been general anesthetized with endotracheal intubation and control ventilation
4. Patients who have provided consent for the participation in the research and for the use of their medical record in research

Exclusion Criteria:

1. Pregnant patients
2. Patients who have a history of local anesthetic allergy and/ or anaphylaxis