Three cases of pituitary metastases were reported. They all had operations and the pathological exami-nation confirming the diagnosis. The clinical features of diabetes insipidus and extraocular nerve palsy were presented. In two cases

the original tumors were bronchioloalveolar carcinoma; in the other one

the original tumor was unknown. All three cases had poor outcome. These cases illustrate the fact that a pituitary metastasis can closely mimic a pituitary benign tumor

such as pituitary adenoma. Especially in the presence of suggestive symptoms such as diabetes insipidus and/or cranical nerve paralysis

the possibility of metastatic disease in the differential diagnosis of a pituitary mass should always be considered.