A Giant Prolactinoma: A Case Report

A 38-years-old woman presented to our hospital 2 years ago with 5-year history of reduced vision, chronic cephaleea and secondary amenorrhea. Her baseline prolactin level was 46504 ?IU/mL (reference range=127-637mUI/ml) with secondary hypogonadism, and pituitary magnetic resonance imaging revealed a giant prolactinoma (4 × 2.2 × 2.6 cm3) with suprasellar extension, optic chiasma and right cavernous sinus compression. She was initially treated with cabergoline in order to reduce the prolactin level and tumoral mass, but after 6 months of medical treatment she proceed to transsphenoidal tumor debulking surgery. Prolactin level dropped in the normal range only after the addition of cabergoline treatment after surgery (1 mg/day 3 times/per week). However, the extensive tumour was not completely resectable so she remained amenorrheic requiring hormone replacement therapy as well as thyroxine replacement due to the development of TSH deficiency (free T4 6.03 pmol/L)