Background: Multiple endocrine neoplasia (MEN) type 2a is an autosomal dominant syndrome caused by specific proto-oncogene mutations characterized by medullary carcinoma of the thyroid, pheochromocytoma, and, occasionally, multiglandular parathyroid hyperplasia, which rarely complicates pregnancy. Secondary diabetes rarely has been reported in association with principal endocrinopathies complicating pregnancy.
Case: A 34-year-old primiparous woman with recently diagnosed gestational diabetes had repeated episodes of dizziness at 30 weeks of gestation, initially attributed to glyburide.