# Kidney Stone Risk in Normocalcemic Hyperparathyroidism before and after Parathyroid Surgery

## TL;DR

This paper discusses a case where kidney stone risk remained high in a patient with normocalcemic hyperparathyroidism even after surgery.

## Contribution

The study presents a unique case showing that parathyroid surgery does not necessarily reduce kidney stone risk in normocalcemic hyperparathyroidism.

## Key findings

- Surgical resection of the parathyroid adenoma did not reduce kidney stone risk based on 24-hr urine studies.
- Kidney stone burden remained unchanged based on ultrasound findings after surgery.

## Abstract

The higher risk for kidney stone in patients with primary hyperparathyroidism is well-documented; stone risk in patients with normocalcemic primary hyperparathyroidism (NPHPT) remains unclear. We present a case of recurrent calcium kidney stones in a patient with severe idiopathic hypercalciuria and NPHPT. The surgical resection of the parathyroid adenoma failed to reduce kidney stone risk (based on the 24-hr urine study) and kidney stone burden (based on ultrasound). This unique case examines the impact of surgical resection of an ectopic parathyroid adenoma on stone risk in a patient with NPHPT and recurrent calcium kidney stones.