pituitary gland hyperplastic lesion incidence/prevalence measurement percentage of study population developing pituitary gland hyperplastic lesions during a period of time 2013-06-11T20:12:23Z CMO:0001622 JSmith The number of new cases of pituitary gland hyperplastic lesions appearing in a study population during a certain period compared to the total number of individuals in the study population, expressed as a percentage. 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. clinical_measurement_ontology pituitary gland hyperplastic lesion incidence