Per the most recent clinical practice guidelines, a patient can be diagnosed with MEN1 by meeting any one of the following three conditions: the occurrence of at least two primary MEN1-associated endocrine tumors (i.e., parathyroid adenoma, enteropancreatic tumor, and pituitary adenoma); the development of one MEN1-associated tumor in a first degree relative of a patient with a clinical diagnosis of MEN1; and the identification of a germline MEN1 mutation in an individual, who may be asymptomatic without biochemical or radiological evidence of MEN1 (8). Here, MEN1 is linked to pituitary gland adenoma.