I personally know a man who had dealt with pineal tumor all by himself. The person he healed was close to surgery too, as well.
As far as I know, he extended preparations for over a week before doing it, including:
reading about everything anatomy and biochemistry related to that exact disease
daily banishing energies that may get in a way during the process
staying emotionally “clear”
From what I can recall, he told me that he had affected the biochemistry of the area of the pineal gland through the means of magic, and after a week it was gone completely.
He said they knew it because typical brain symptoms like loss of balance had vanished, which is impossible if the tumor was still intact
So, if you know someone skilled enough, you can ask for their help