A case of recurrent Cushing's disease with optimised perinatal outcomes.

Summary: This is a case of a patient with a 10-year history of Cushing's disease (CD) that was previously treated with transsphenoidal pituitary tumour resection. Conception occurred spontaneously, and during early pregnancy recurrent CD became apparent both clinically and biochemically. Repeat transsphenoidal surgery took place during the second trimester, and the high-risk pregnancy resulted in a live neonate. Despite evidence of hypercortisolism and recurrent CD at 6 months postpartum, the patient had a second successful, uncomplicated pregnancy, further adding to the rarity and complexity of this case. Pregnancy in CD is rare because hypercortisolism seen in CD suppresses gonadotropin release, leading to menstrual irregularities and infertility. Diagnosis of CD is particularly challenging because many clinical and biochemical features of normal pregnancy overlap considerably with those seen in CD. Diagnosis and treatment are extremely important to reduce rates of perinatal morbidity and mortality. Learning points: Hypercortisolism suppresses gonadotropin release, leading to menstrual irregularities and infertility. In CD, hypersecretion of both androgens and cortisol further contributes to higher rates of amenorrhoea and infertility. Pregnancy itself is a state of hypercortisolism, with very few studies detailing normal ranges of cortisol in each trimester of pregnancy for midnight salivary cortisol and urinary free cortisol testing. Treatment of CD reduces maternal morbidity and rates of foetal loss, and can be either surgical (preferred) or medical. CD can relapse, often many years after initial surgery. There are a limited number of cases of Cushing's syndrome in pregnancy, therefore, the best possible treatment is difficult to determine and should be individualised to the patient.