Transient neonatal hyperparathyroidism associated with maternal hypoparathyroidism.

The newborn infant of a mother with hypoparathyroidism following thyroidectomy showed transient hypercalcemia and hypermagnesemia. Hypophosphatemia, as found in adult hyperparathyroidism, was not noted in this case, or in three of five other reported cases of neonatal hyperparathyroidism secondary to maternal hypoparathyroidism.