Migration of embolized coil into the renal pelvis with large renal stone formation: A rare case presentation

 

Urinary tract interventions can lead to multiple complications in the collecting system, including retained foreign bodies such as ureteral stents, nephrostomy tubes and others. We report a rare case of embolized coil migrated into renal pelvis as a nidus for renal stone formation. The 60-year-male presented with fever was hospitalized at ward of infectious disease initially. Urine culture was positive for Pseudomonas aeruginosa. X-ray KUB revealed a 1.6x2.3 cm renal pelvic calculus resided on the coils. He underwent right percutaneous nephrostomy for hydronephrosis at a certain hospital four years ago. However, acute renal hemorrhage developed after the procedure. Transcatheter renal artery embolization by coiling was performed at that time. Then the stone together with coils were pulverized by retrograde intrarenal surgery with holmium laser. Five days after the surgery, the patient complained of sudden onset right flank pain. Computed tomography showed a large right renal subcapsular hematoma measuring 9.4x5.3 cm. There were residual fragments of coils with almost stone free status. After conservative treatment, the hematoma resolved gradually confirmed by image study. Later he was followed up in outpatient department and was doing well.