pituitary gland hyperplastic lesion measurement pituitary gland hyperplastic lesion incidence/prevalence measurement 2013-06-11T20:06:20Z Any measurement in which the number of individuals in a study population that display pituitary gland hyperplastic lesions at a point in time or develop pituitary gland hyperplastic lesions within a determined period of time are compared to the total number of individuals in the study population. Often expressed as a percentage but could be expressed as a ratio. A pituitary gland hyperplastic lesion is a localized pathological change, especially one that is circumscribed and well defined, in structure of the pituitary gland, due to injury or disease and characterized by an abnormal increase in the number of normal cells in normal arrangement in the gland resulting in an increase in the size of the tissue. The pituitary gland is the small, oval endocrine gland attached to the base of the vertebrate brain and consisting of an anterior and posterior lobe, the secretions of which control the other endocrine glands and influence growth, metabolism, and maturation. CMO:0001621 JSmith clinical_measurement_ontology pituitary gland hyperplasia incidence/prevalence measurement pituitary gland tumorous lesion incidence/prevalence measurement