Thanks for consulting us.
A malignant tumor
will not stay there for 6 years without bothering you. Medical treatment is the gold standard for such a problem. I hope you are in touch with your doctor & having regular follow ups of your prolactin
levels. MRI or surgical treatment
is only required if levels are too high or if there are pressure symptoms like headache, visual field
No need of MRI if no such problem.
Wish you good health.