https://gamefaqs.gamespot.com/a/forum/d/d2d5ea75.jpg
Gonna hazard a guess that leaving a worm carcass in your brain is fatal so I think I will side with the first doctor's opinions and say he's got a benign tumor.
It says right here in Matthew 16:4 "Jesus doth not need a giant Mecha."
https://i.imgur.com/dQgC4kv.jpg