RecruitingPhase 1Drug trialUse of [18F] Fluoroethyl-L-tyrosine PET/MRI for Identifying Small Functional Pituitary AdenomasThe purpose of this research is to evaluate the diagnostic role and clinical efficacy of investigational FET-PET/MRI in detecting MRI-occult primary or residual/recurrent functional pituitary adenomas (PAs) and its influence on clinical and surgical decisions.