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Diagnosis and selective cure of Cushing's disease during pregnancy by transsphenoidal surgery

Ross RJM, Chew SL, Perry L, Erskine K, Medbak S, Afshar F. Diagnosis and selective cure of Cushing's disease during pregnancy by transsphenoidal surgery. Eur J Endocrinol 1995;132:722–6. ISSN 0804–4643

The diagnosis of Cushing's Disease during pregnancy is complex because the biochemical features are obscured by changes in the normal hypothalamo-pituitary-adrenal axis that occur during gestation. To date, treatment has not been successful and there is a high incidence of maternal and fetal complications. We report the case of a 24-year-old woman with Cushing's disease who presented during her 16th week of pregnancy. Diagnosis was confirmed by the finding of elevated serum and urinary free cortisol levels with loss of the normal circadian rhythm of serum cortisol. Cortisol levels failed to suppress after a low-dose dexamethasone test but suppressed after a high-dose test. There was an exaggerated serum cortisol and plasma adrenocorticotrophin (ACTH) response to corticotrophinreleasing hormone (CRH). Magnetic resonance (MR) scanning demonstrated a pituitary tumour and cure was effected by transsphenoidal surgery where tumour immunostaining for ACTH was removed. Postoperatively the patient made an uncomplicated recovery; serum cortisol and plasma ACTH levels were undetectable at 9 days following surgery and recovery of the hypothalamo-pituitary axis occurred at 99 days after surgery. Caesarean section was performed at 38 weeks of pregnancy and a healthy but small female infant was delivered. This case illustrates the biochemical features of Cushing's disease during pregnancy and is the first report of the use of CRH testing and MR scanning in this clinical situation. The cure by surgery and successful outcome for mother and infant, with preservation of normal anterior pituitary function, suggest that transsphenoidal surgery may be the treatment of choice.

RJM Ross, Dept of Endocrinology, St Bartholomew's Hospital, London ECIA 7BE, UK

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