This case report describes a 30-year-old woman with primary hyperparathyroidism due to a parathyroid adenoma who became pregnant while awaiting surgery. Despite apparently normal total serum calcium during pregnancy, she developed threatened preterm labor and delivered a macrosomia infant at 37 weeks, who subsequently presented with transient neonatal hypercalcemia. The authors review the literature on maternal and neonatal complications associated with hyperparathyroidism in pregnancy and emphasize the importance of early diagnosis and multidisciplinary management.
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