Related Experiment Video
Updated: Aug 22, 2025

Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations
Published on: October 20, 2017
Immediate and delayed migration of Onyx embolisation into the renal collecting system
Sarah Azari1, Bohan Liu2, Shawn Sarin3
1Department of Urology, The School of Medicine and Health Sciences, The George Washington University, Washington, DC, USA saraheazari@gmail.com.
Abstract:
We present a case of Onyx embolisation of a renal pseudoaneurysm following partial nephrectomy with collecting system involvement with subsequent migration of Onyx into the renal collecting system resulting in renal obstruction. This occurred both immediately after embolisation and again 8 years after embolisation. Both cases required ureteroscopic surgical intervention. In the first instance, the pieces were removed using basket extraction. In the second, laser lithotripsy was used in addition to basket extraction. While there are a few cases of embolisation coils eroding into the renal collecting system, this is the second reported case of Onyx migration and the first where ureteroscopy with laser lithotripsy was used. The patient is doing well and undergoing surveillance ultrasounds to ensure there is no further Onyx migration. This may be a consideration for patients with pseudoaneurysm embolisation especially in the setting of prior collecting system damage.
Related Concept Videos
Kidney Transplant II: Surgical Procedure
Imaging Studies VII: Vascular Imaging
Renal Tubule and Collecting Duct
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
Acute Kidney Injury II: Pathophysiology
Imaging Studies V: Intravenous Urography and Retrograde Pyelography
Acute Kidney Injury III: Clinical Manifestations

