Abstract
As clearly and compendiously stated by the reviewer, magnetic resonance urography (MRU) has the potential to be the much anticipated alternative to investigations that require the use of ionizing radiation and contrast. The oncogenic risks 1 Pearce M.S. Salotti J.A. Little M.P. et al. Radiation exposure from CT scans in childhood and subsequent risk of leukaemia and brain tumours: a retrospective cohort study. Lancet. 2012; 380: 499-505 Abstract Full Text Full Text PDF PubMed Scopus (2493) Google Scholar attributed to computed tomography (CT) are augmented in urologic studies, which typically require dual or triple phase scanning. 2 Silverman S.G. Leyendecker J.R. Amis Jr., E.S. What is the current role of CT urography and MR urography in the evaluation of the urinary tract?. Radiology. 2009; 250: 309-323 Crossref PubMed Scopus (191) Google Scholar Although CT with or without contrast has by and large replaced intravenous urography (IVU), 2 Silverman S.G. Leyendecker J.R. Amis Jr., E.S. What is the current role of CT urography and MR urography in the evaluation of the urinary tract?. Radiology. 2009; 250: 309-323 Crossref PubMed Scopus (191) Google Scholar , 3 Fielding J.R. Steele G. Fox L.A. et al. Spiral computerized tomography in the evaluation of acute flank pain: a replacement for excretory urography. J Urol. 1997; 157: 2071-2073 Abstract Full Text Full Text PDF PubMed Scopus (215) Google Scholar we are not alone in the belief that the latter cannot yet be written off, 4 Whitfield A.H. Whitfield H.N. Is there a role for the intravenous urogram in the 21st century?. Ann R Coll Surg Engl. 2006; 88: 62-65 Crossref PubMed Scopus (7) Google Scholar more so in resource-poor settings. It is again the cost, along with ease of interpretation, excellent spatial resolution and, quite often, clinician familiarity, which give CT urography the edge over MRU in most cases. Editorial CommentUrologyVol. 81Issue 3PreviewThe authors offer use of static magnetic resonance urography (MRU) in diagnosing hydronephrotic or obstructed renal pathology as opposed to conventional intravenous urography (IVU). They found that the sensitivity and the specificity of MRU was 95% and 100%, respectively, for finding hydronephrosis, although determining the exact grade of obstruction was not as precise (from 33.3% to 92.6% with increasing grades of hydronephrosis). Calculus disease was only determined in 46.6% of imaging studies, but this review was based on elective imaging only. Full-Text PDF
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