Pituitary Neuroendocrine Tumor

A well-differentiated neuroendocrine neoplasm that arises from the adenohypophysial cells of the anterior lobe of the pituitary gland. The tumor can be hormonally functioning or not. It has a low frequency of metastatic spread. When metastatic, the term metastatic pituitary neuroendocrine tumor is endorsed instead of pituitary carcinoma. (WHO)

Source: NCI Thesaurus (C3329).