An association between neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia in three kindreds.

Four cases of neonatal severe primary hyperparathyroidism occurred in three families; familial hypocalciuric hypercalcemia was present in each kindred. The diagnosis of familial hypocalciuric hypercalcemia was based on the following features; hypercalcemia in many relatives (eight to 16 per kindred), without other features of the multiple endocrine neoplasia syndromes; recognition of hypercalcemia before the age of 10 in one to three relatives; hypocalciuric hypercalcemia in all relatives tested (five to 14 per kindred); and abnormal serum calcium levels despite parathyroidectomy in all additional relatives (one to five per kindred) undergoing this operation. The association of two uncommon syndromes (neonatal severe primary hyperparathyroidism and familial hypocalciuric hypercalcemia) in these kindreds suggests that the two syndromes share a common genetic cause within each kindred.

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