Cushing's syndrome in childhood and adolescence.

OBJECTIVE: To review the diagnosis, management and outcome of Cushing's syndrome in children and adolescents.

METHODS: We conducted a retrospective review of nine cases treated between 1976 and 1996 at the Royal Children's Hospital, Melbourne, Australia.

RESULTS: Six children with Cushing's disease and three with primary adrenal disease were identified. Mean age at diagnosis in the Cushing's disease patients was 11.3 years and in the children with primary adrenal disease 9.5 years. The most common presenting symptoms were weight gain and delayed growth. Two children had the unusual presenting symptoms of an eating disorder and hemihypertrophy, respectively. Laboratory diagnosis of Cushing's syndrome was established by demonstration of elevated urine free cortisol, loss of normal diurnal variation of serum cortisol, and loss of suppressibility of cortisol secretion by low dose dexamethasone. Investigations used to determine the aetiology of hypercortisolism included serum adrenocorticotropic hormone (ACTH) levels, high dose dexamethasone suppression tests, imaging studies, and inferior petrosal sinus sampling. Four patients with Cushing's disease had successful transphenoidal adenomectomies. Two patients with bilateral primary pigmented nodular adrenocortical dysplasia underwent bilateral adrenalectomies. One child with an adrenal adenoma was treated by left adrenalectomy.

CONCLUSIONS: Cushing's syndrome in children and adolescents remains a diagnostic challenge. Successful treatment often requires the use of multiple tests to achieve the correct diagnosis, appropriate surgery and a good long-term outcome.