The ancient treatment process of cutting a hole in the skull to allow evil spirits that were thought to cause disease a way to exit the body was called:

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Trephining, also known as trepanning, is the ancient practice of drilling or scraping a hole into the human skull to treat intracranial diseases or release pressured blood buildup from head injuries, but it was also thought to allow evil spirits causing illness to escape.

The Ancient Treatment Process of Cutting a Hole in the Skull