# Migrated embolization coil as a nidus for recurrent renal stones: A case report

## TL;DR

A migrated embolization coil can cause recurring kidney stones, as shown in a case where the coil served as a stone-forming site.

## Contribution

This case report highlights a rare complication of embolization coil migration leading to recurrent renal stones.

## Key findings

- An embolization coil migrated into the renal collecting system after renal arterial embolization.
- The migrated coil acted as a nidus for recurrent stone formation.
- Partial endoscopic removal of the coil was performed to manage the stones.

## Abstract

Migration of embolization coils into the urinary collecting system is an exceedingly rare complication that may lead to recurrent urolithiasis. We report a case of recurrent renal stone formation caused by intraluminal migration of an embolization coil following selective renal arterial embolization performed for post–percutaneous nephrolithotomy (PCNL) hemorrhage. During ureteroscopic stone management, the coil was identified within the renal collecting system, serving as a nidus for stone formation, and was partially removed endoscopically. Recognition of this rare complication is essential for accurate diagnosis and appropriate management in patients presenting with recurrent renal stones after renal arterial embolization.