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Adrenal failure secondary to hypothalamic-pituitary disease is a common although underestimated and underdiagnosed condition, with serious consequences. Corticotropin deficiency can be isolated or more frequently occur in association with other pituitary hormones deficiencies. The most frequent endogenous cause of secondary adrenal insufficiency (SAI) is a tumor of the hypothalamic-pituitary region, usually associated with panhypopituitarism secondary to tumor growth or to its treatment with surgery or irradiation. Less commonly, SAI is due to nontumoral disorders including infiltrative lesions, infective processes, vascular alterations, traumatic brain injury, empty sella or genetic disorders. Finally, long-term administration of exogenous glucocorticoids can determine secondary and/or tertiary hypoadrenalism acting at the hypothalamic level and leading to prolonged suppression of the hypothalamic-pituitary-adrenal axis. It is essential to perform validated diagnostic procedures in order to promptly diagnose hypoadrenalism so as to prevent an adrenal crisis. At the same time, diagnosis is complex as no single test has sufficient sensitivity to identify all patients with SAI. Therefore, clinical judgment and follow-up are crucial for the assessment of corticotropin deficiency. Patients with persisting suggestive symptoms and/or a clinical history of higher risk for adrenal insufficiency deserve careful subsequent reassessments.

Secondary Adrenal Insufficiency: Where Is It Hidden and What Does It Look Like?