Vesicoureteral Reflux (VUR) By Ronald Rabinowitz, MD, University of Rochester Medical Center; Jimena Cubillos, MD, University of Rochester School of Medicine and Dentistry Reviewed / Revised Aug 2022 | Modified Sep 2022 View Patient Education Etiology Pathophysiology Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Grades of Vesicoureteral... How to Catheterize the Urethra... Vesicoureteral reflux is retrograde passage of urine from the bladder back into the ureter and sometimes also into the renal collecting system, depending on severity.