NCIt definition : A condition of diminution or cessation of secretion of one or more hormones from the
anterior pituitary gland. This may result from surgical or radiation ablation, non-secretory
pituitary neoplasms, metastatic tumors, infarction, pituitary apoplexy, infiltrative
or granulomatous processes, and other conditions.;
Alternative definition : NICHD: Subnormal concentration of two or more pituitary hormones.;