Erosion of Embolization Coils into the Renal Collecting System Mimicking Stone

Urinary tract interventions can lead to multiple complications in the renal collecting system, includingretained foreign bodies from endourologic or percutaneous procedures, such as stents, nephrostomytubes, and others. We report a case of very delayed erosion of embolization coils migrating into therenal pelvis, acting as a nidus for stone formation, causing mild obstruction and finally leading to grosshematuria roughly 18 years post transarterial embolization. History is significant for a remoteunsuccessful endopyelotomy attempt that required an urgent embolization. [West J Emerg Med.2012;13(1):127–130.