Endocrine Gland Neoplasms [Disease/Finding] Hypothalamic Neoplasms [Disease/Finding] Pituitary Diseases [Disease/Finding] Pituitary Neoplasms [Disease/Finding] 1027456 C0032019 127024001 D010911 Pituitary Neoplasms Neoplasms which arise from or metastasize to the PITUITARY GLAND. The majority of pituitary neoplasms are adenomas, which are divided into non-secreting and secreting forms. Hormone producing forms are further classified by the type of hormone they secrete. Pituitary adenomas may also be characterized by their staining properties (see ADENOMA, BASOPHIL; ADENOMA, ACIDOPHIL; and ADENOMA, CHROMOPHOBE). Pituitary tumors may compress adjacent structures, including the HYPOTHALAMUS, several CRANIAL NERVES, and the OPTIC CHIASM. Chiasmal compression may result in bitemporal HEMIANOPSIA. Pituitary Tumors N0000002408 M0016922 C4994 Pituitary Neoplasms