CYP24A1 and neonatal severe primary hyperparathyroidism: Moreover, we confirmed the initial clinical diagnosis of neonatal hyperparathyroidism in one patient (index case CA0110 had a homozygous pathogenic variant in the CASR gene) and infantile hypercalcemia in another patient (index case CA0139 had two pathogenic variants in compound heterozygous state in the CYP24A1 gene).