Vasopressin resistant diabetes insipidus in a patient with idiopathic hypercalciuria

An eleven year old boy with clinical presentation of diabetes insipidus [DI] was proved to have vasopressin resistant DI secondary to idiopathic hypercalciuria [IH]. He responded to treatment of hypercalciuria and eventually remained well, with normal urine calcium excretion. This case illustrates that IH must be considered in patients with vasopressin resistant DI