Unmasking of primary hyperparathyroidism by Vitamin D therapy.

A 38-year-old female on Vitamin D therapy presented with hypercalcemia induced acute kidney injury. Evaluation revealed primary hyperparathyroidism (PHPT) and iatrogenic hypervitaminosis D. After medical stabilization, she underwent surgical removal of the parathyroid adenoma, and made a full recovery. This case highlights unmasking of subclinical hyperparathyroidism by vitamin D therapy leading to severe hypercalcemia.