A 7-year-old girl is suffering from extreme thirst and increased urination. She appears to be dehydrated and has a short stature. She is found to have hypokalemic, hypochloremic alkalosis. A 24-hour urine collection reveals hypercalciuria.

What is the most likely diagnosis for this child? *This Case Challenge is from the Editorial Team of Docplexus and is meant for educational purposes only.