[Abnormal growth of cells in the pituitary gland that can either secrete hormone or not. The diagnosis can be based on imaging studies and/or radioimmunoassays. Due to their location in the sella turcica, expansion of the tumor mass can impinge on the optic chiasm or involve the temporal lobe, third ventricle and posterior fossa. A frequently associated physical finding is bitemporal hemianopsia which may progress to further visual loss. ( NCI )]
UMLS (NCI) C0032000