# Long-term kidney function stabilization with fludrocortisone in autosomal recessive renal tubular dysgenesis: a case report

## TL;DR

A 10-year-old girl with a rare kidney disorder showed long-term improvement in kidney function after receiving fludrocortisone treatment.

## Contribution

This case report demonstrates the long-term efficacy of fludrocortisone in managing autosomal recessive renal tubular dysgenesis.

## Key findings

- The patient experienced long-term improvement in kidney function following fludrocortisone therapy.
- Fludrocortisone helped stabilize electrolyte abnormalities and reduce polyuria in the patient.
- The case highlights the potential for long-term management of a rare genetic kidney disorder.

## Abstract

Renal tubular dysgenesis (RTD) is a rare disorder characterized by impaired development of the proximal tubules and kidney dysfunction due to decreased fetal renal plasma flow and renin-angiotensin system (RAS) inhibition. Fetal anuria causes severe oligohydramnios and Potter sequence, and most patients die within days after birth due to refractory hypotension, anuria, and respiratory distress. While vasopressin and fludrocortisone therapy have been reported, the long-term efficacy remains unclear due to the rarity of survivors. We report a 10-year-old girl with autosomal recessive renal tubular dysgenesis (ARRTD), a genetic form of RTD caused by mutations in RAS-related genes. She initially experienced recurrent dehydration, electrolyte abnormalities, and kidney dysfunction due to polyuria but showed long-term improvement following fludrocortisone therapy.

The online version contains supplementary material available at 10.1007/s00467-025-07051-2.