Browsing by Author "Ramesh, A"

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    The Role of Static Magnetic Resonance Urography in the Evaluation of Obstructive Uropathy
    (UROLOGY, 2013) Muthusami, P; Bhuvaneswari, V; Elangovan, S; Dorairajan, LN; Ramesh, A
    OBJECTIVE To assess the diagnostic accuracy of static magnetic resonance urography (MRU) in hydronephrosis and to compare parameters of hydronephrosis in MRU with intravenous urography (IVU). MATERIALS AND METHODS Sixty-nine patients were included in this study of which 55 patients with a total of 63 hydronephrotic units underwent both IVU and MRU. MRU was performed on a 1.5 T scanner using heavily T2-weighted sequences. The level, grade, and cause of obstruction on each modality were interpreted by 2 radiologists. These were compared with the final diagnosis based on other appropriate modalities including imaging, intraoperative and histopathologic diagnosis. RESULTS The sensitivity and specificity MRU in detecting hydronephrosis were 95% and 100%, respectively. In determining the level of obstruction, the strength of agreement between IVU and MRU using kappa statistics was kappa = 0.66, which corresponds to a good level of agreement. The Spearman correlation coefficient for the grade of hydronephrosis on MRU and IVU was 0.92 (95% confidence interval 0.86-0.95), with a P value of <.0001. The correct diagnosis was made in 89.2% of the cases by IVU and in 93.8% of the cases by MRU. CONCLUSION Along with a high sensitivity and specificity in detecting the presence, level, and grade of hydronephrosis, MRU without contrast also shows a good agreement with IVU. Static MRU can reliably replace IVU when the latter is contraindicated or technically difficult. UROLOGY 81: 623-628, 2013. (c) 2013 Elsevier Inc.