Prolactinoma

A 22-year-old woman who wants to become pregnant has had no menses since she discontinued the use of an oral contraceptive one year ago, and recently, galactorrhea developed. She takes no medications and has had no headaches, visual loss, dyspareunia, or decreased libido. A test for serum human chorionic gonadotropin is negative, the thyrotropin level is normal, and the serum prolactin level is 95 μg per liter. Magnetic resonance imaging reveals a mass, 3 mm in diameter, in the anterior lobe of the pituitary. How should she be treated?