Morphologic and functional evaluation of duplicated renal collecting systems with MR urography: A descriptive analysis.

TitleMorphologic and functional evaluation of duplicated renal collecting systems with MR urography: A descriptive analysis.
Publication TypeJournal Article
Year of Publication2019
AuthorsCalle-Toro JS, Maya CL, Emad-Eldin S, Adeb MD, Back SJ, Darge K, Otero HJ
JournalClin Imaging
Volume57
Pagination69-76
Date Published2019 May 15
ISSN1873-4499
Abstract

PURPOSE: To describe the morphology and function of duplicated collecting systems in pediatric patients undergoing functional MR urography (fMRU).

METHODS: This is a HIPAA compliant IRB approved retrospective study of all patients with duplicated renal collecting systems undergoing fMRU at our institution between 2010 and 2017. Two pediatric radiologists evaluated the studies to determine the presence, morphology and function of duplicated collecting systems using both T2-weighted and dynamic post-contrast fat saturated T1-weighted images. Assessed morphologic features included pelvic and calyceal dilation, partial or complete ureteral duplication, ureteral dilation, ectopic ureteral insertion and ureteroceles. Functional analysis was carried out per moiety.

RESULTS: A total of 86 examinations (63 girls; 23 boys), median age 2.6 years (Standard Deviation 6.4 years, interquartile range: 0.4-10.3 years) and 107 kidneys (39 right; 30 left and 19 bilateral), which yielded 214 evaluable moieties, were included in the final sample. One hundred and sixty-three (76.1%) of the moieties had normal morphological features and normal functional results (average calyceal transit time and renal transit time of 2 min 28 s and 3 min 16 s, respectively). The remaining 51 moieties (23.8%) were hypoplastic or dysplastic. Seventy-seven (35.9%) had pelvic and calyceal dilation. Slightly more than half of the kidneys had complete ureteral duplication (60/107; 56%); 50 (50/107, 46.7%) had ectopic ureters (23 intra- and 27 extravesical) and 9 (9/107, 8.4%) had ureteroceles.

CONCLUSION: fMRU provides comprehensive information regarding the morphology and function of duplicated renal collecting systems in children. In particular, fMRU is useful for assessing barely or non-functioning renal poles and ectopic ureters.

DOI10.1016/j.clinimag.2019.05.004
Alternate JournalClin Imaging
PubMed ID31136881