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with an impaired kidney function to minimize the risk of the nephrogenic systemic fibrosis. indications for mrU and fmrU The main indications for MRU/fMRU are congenital anomalies of kidney and urinary tract (CAKUT) and evaluation of congenital and acquired hydronephrosis (HN) and sus- pected obstructive uropathy. CAKUT are presented as complex pathology and till fMRU they require a combination of different imaging and functional methods to obtain an adequate anatomic and functional characterization. In evaluation of HN and suspected obstructive uropathy fMRU has proved to be a useful tool to analyze both anatomic and functional information. It can be used to determine whether an obstruction is present, to evaluate its severity (grading HN), to identify its location and its cause (ureteral kinks, strictures, crossing vessel), and to assess the quality of the renal parenchyma (normal, uropathic, decompensated). concLUsion fMRU is a promising tool for the assessment of the urinary tract in children. Its ability to provide detailed information regarding anatomy, as well as renal function and drainage in a single study without the use of ionizing radiation sets MRU above conventional imaging techniques. We have to be aware of the limitations in the interpretation of functional results. Team work is crucial in introducing a new method in everyday clinical practice. references 1. Cerwinka WH, Grattan-Smith JD, Kirsch JA. Magnetic resonance urography in pediatric urology. J Ped Urol 2008; 4: 74-83. 2. Grattan-Smith JD, Little SB, Jones RA. MR urography in children: how we do it. Pediatr Radiol 2008; 38 (Suppl 1):S3–S17. 3. Khrichenko D, Darge K. Functional analysis in MR urography — made simple. Pediatr Radiol 2010; 40:182–99. 4. Ključevšek D. Indications and the role of Magnetic resonance urography in children with congenital urinary anomalies. Postdiplomski tečaj stalnog medicinskog usavršavanja. 23. In 24.9.2014, Rijeka, Hr- vaška. Editor: Šubat Dežulović M. Urinarna infekcije u djece – aktualnosti. 2014: 36-9. 5. Vivier PH, Dolores M, Taylor M, Elbaz F, Liard A, Dacher JN. MR urography in children. Part 1: how we do the F0 technique. Pediatr Radiol 2010; 40:732–8. 6. Vivier PH, Dolores M, Taylor M, Dacher JN. MR urography in children. Part 2: how to use ImageJ MR urography processing software. Pediatr Radiol 2010; 40:739–46. 37