This study aims to investigate if endoscopic trans-sphenoidal prolactinoma resection as a
first line treatment, or as an equally valid second line treatment after a short (4-6 months)
or long (>2 years) period of pretreatment with a dopamine agonist is superior to standard
care for several outcome parameters. The main objectives are to investigate this for quality
of life and remission rate. The secondary objectives are to investigate this for biochemical
disease control, recurrence rates, clinical symptom control, tumor shrinkage on MRI,
pituitary functioning, the occurrence of adverse reactions to treatment, disease burden, and
cost-effectiveness.