Pituitary tumors are recognized as the initial manifestation of MEN1 in 15%-20% of cases, and most pituitary tumors in MEN1 are macroprolactinomas [3]. Macroprolactinomas in MEN1 are more likely to be locally invasive than sporadic macroprolactinomas, and they may be less responsive to dopamine agonists than sporadic tumors [3]. Here, MEN1 is linked to pituitary tumor.