organ tumorous lesion incidence/prevalence measurement pituitary gland tumorous lesion measurement pituitary gland tumorous lesion incidence/prevalence measurement 2013-06-11T20:31:44Z Any measurement in which the number of individuals in a study population that display pituitary gland tumorous lesions at a point in time or develop pituitary gland tumorous 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 tumorous lesion is one which is or has the potential to become a tumor, that is, a neoplasm or new growth of tissue in which cell multiplication is more or less uncontrolled and progressive. Tumorous lesions include tumors, preneoplastic lesions, and hyperplastic lesions composed of histologically normal cells. 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:0001624 JSmith clinical_measurement_ontology