Severe hypercalcemia that occurs in infancy and is characterized by elevated calcium levels in blood and urine, failure to thrive, vomiting , dehydration, and NEPHROCALCINOSIS. HCINF1 is caused by mutations in the CYP24A1 gene (OMIM: 143880) and HCINF2 is caused by mutations in the SLC34A1 gene (OMIM: 616963).
