Abstract
A number of morphologic and physiologic changes accompany pregnancy such as an increase in lactotrophs and prolactin production, and a decrease in gonadotropins and GH. The hormonal milieu can affect patients with prolactinomas, especially macroadenomas, to cause an increase in size in a minority of patients. Complications are treated with bromocryptine. Enlargement of GH-secreting tumors with acromegaly may respond to bromocryptine and possibly to octreotide. Pituitary tumors causing Cushing's syndrome may need removal if major complications develop. Hypopituitarism during pregnancy may be the result of lymphocytic hypophysitis or antepartum pituitary necrosis, and in the postpartum period may be because of postpartum hemorrhage and pituitary necrosis. These abnormalities need prompt recognition and hormonal replacement therapy with neurosurgical decompression to avoid serious morbidity and mortality. Posterior pituitary problems in pregnancy usually manifest by diabetes insipidus, with a pregnancy-specific variety resulting from excessive degradation of AVP by placental vasopressinase. The condition is treated with an analogue dDAVP, which is resistant to vasopressinase.
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