Kidney structure and function in dilating vesicoureteral reflux patients with anorectal malformation.

Background: We assessed the impact of anorectal malformation (ARM) on the kidneys of children with dilating vesicoureteral reflux (D-VUR) ≥grade III using a simple dimercaptosuccinic acid (DMSA) scintigraphy scan based renal dysfunction score (RDS). Methods: The medical records of 121 patients with D-VUR treated between 2000 and 2014 were reviewed retrospectively. After excluding patients with secondary D-VUR (n=18), presence of ARM was used to create two groups: ARM+ (n=12 cases; 15 ureters) and ARM- (n=91 cases; 131 ureters). Types of ARM, grades of D-VUR, bladder and bowel dysfunction (BBD) and RDS were compared. Results: Patient demographics, mean follow-up, grades of D-VUR and history of urinary tract infections were not significantly different. BBD was significantly higher in ARM+ (41.7% versus 7.7%, p=0.0006). RDS was significantly higher in ARM+ (p=0.036). Grades of D-VUR were significantly lower in ARM- with low RDS (p=0.008). During follow-up, changes in DMSA uptake over time were not observed in ARM+. Conclusions: While renal cortical lesions were correlated with grade of D-VUR in ARM- and RDS was significantly higher in ARM+, BBD did not appear to contribute to progressive renal dysfunction as is commonly believed. In fact, no progression in renal cortical lesions was observed in ARM+ based on RDS data. Renal cortical lesions may possibly be a feature of ARM, a topic that warrants further study.