Gamma Knife can be used to treat tumors and vascular disorders in the skull as well as different tumors. This method can be applied successfully in the treatment of tumors located on the upper side with the sinus and pharyngeal region. It is located in these regions and is about 3, 5 cm. These tumors can be successfully treated with Gamma Knife. The tumor or diseased tissue is not removed with the Gamma Knife. Instead, damage is generated in the DNA of the cells. As a result, tumor cells lose their normal traits and die.