Because of my hyperprolactinemia my doctor ordered an mri, which showed a tiny prolactinoma. i dont have any symptoms, and these findings were all accidental. do i have to take cabergolin, or can we just do yearly controls (mri or/and prolactin)?

I would spend a few $ and go to uptodate and read all about this problem. They will have references to different ways to manage it. Read some of them and then discuss with you Dr. I would see an Endocrinologist who has some experience with this problem. Most likely at a Univ Hospital/Medical School.

You do not need treatment if the prolactinoma is small, i.e. microadenoma, less than 1 cm, which causes no symptoms and prolactin level less than 200 provided your menstrual cycle is normal and you do not try to get pregnant. By UPTODATE: studies of the natural history of microadenomas show that 95 percent do not enlarge during four to six years of observation.