, Volume 14, Issue 6, pp 489-492

Rickets in an infant with Williams syndrome

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Calcium homeostasis is altered in patients with Williams syndrome. We report an infant in whom Williams syndrome was diagnosed at 4 weeks who presented with hypercalcemia, hypercalciuria, and medullary nephrocalcinosis. Fluorescence in situ hybridization demonstrated a deletion of the elastin gene on chromosome 7. This infant was treated with a low-calcium/vitamin D-deficient infant formula that resulted in the development of rickets. Replacement of the low-calcium/vitamin D-deficient formula with standard formula led to resolution of the rickets.

Received: 6 April 1999 / Revised: 10 August 1999 / Accepted: 13 August 1999