MEN1 and pituitary gland adenoma: In patients with MEN1, the goal of screening is two-fold: (1) Early detection of neoplastic processes, mainly regarding NEN of the duodenum, pancreas, lungs, and pituitary adenomas; and (2) Identification of endocrine alterations that require intervention (in PHPT) or of those alterations that may stem from the neoplastic process (PitAd, functional DP-NEN).