MEN1 and pituitary tumor: As a rare disease, the clinical manifestations of MEN1 are currently considered to be associated with the development of combinations of more than 20 different tumors, such as parathyroid adenomas, neuroendocrine tumors, pituitary tumors, as well as lipomas, thymic carcinoids, pheochromocytomas, adrenal adenomas, and ovarian tumors.