Monarch Disease Ontology term MONDO_0005152 (hypopituitarism) is 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. Also known as: pituitary hormone deficiency, pituitary insufficiency.