I saw it around 1995 but the movie might have been older than that. The movie was in color and the scene where the guy has another guy on a table and is pulling a bright green tube like thing from his ear. It might have been in a cave or some place underground. I was six or seven and don’t remember. I’ve been trying to figure the movie out for over 10 years
This probably isn’t it, but the Re-Animator films are the only ones I can think of with bright green tubes. It’s a possibility that being so young you confused the brain injection with the tube being a removal?