Clinical and pathologic features of 88 cases of carcinoma metastatic to the pituitary gland were reviewed. In 61 (69.3%), metastases were localized either in the posterior lobe alone or in the posterior and anterior lobes together; only 12 (13.6%) involved the anterior lobe alone. Diabetes insipidus was present in 6 patients (6.8%), one of whom also had clinical panhypopituitarism due to metastatic tumor and necrosis in the anterior pituitary lobe. Breast and lung were the most frequent primary sites in women and men, respectively. Sixty-four (72.7%) of these glands were grossly normal at necropsy. Metastases to the pituitary gland occur more frequently in the posterior lobe than in the anterior lobe, and my ve reflected clinically by diabetes insipidus in patients with diseminated carcinoma. Clinical panhypopituitarism is a rare accompaniment of anterior lobe involvement.