Adrenocortical insufficiency (AI) is a clinical condition defined by deficient production of glucocorticoids that can result in life-threatening complications. We examined the prevalence of AI in children with brain tumors and those undergoing hematopoietic cell transplantation. Adrenocorticotropic hormone stimulation (stim) testing was used for the assessment of adrenocortical function. On the basis of 155 stim tests in 117 patients, AI was diagnosed in 27.4% of patients with brain tumors and in 21% of hematopoietic cell transplantation recipients. A number of risk factors associated with AI were identified. Adrenocorticotropic hormone stim testing led to a definitive diagnosis of AI or recovery of adrenal function and unambiguous medical management.
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