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Especially when it comes to tumors in the head, the location is in the brainstem, and it's right in the center of a nerve nucleus, exhibiting diffuse growth.
Thus, surgery is almost impossible; if we do operate, we must remove a portion of the normal brainstem tissue along with it. However, the nerve nucleus in the brainstem is critically important, being the central hub of life, and any damage to it would terminate life.
The site and manner of this tumor's invasiveness render even the most skillful surgery powerless, as it has exceeded the scope of surgical intervention.
It's like pouring a cup of water into soil; they have become one and the same. Trying to separate the water from the soil using manual methods for picking beans is simply not possible.