The phenomenon
of obstruction to the normal flow of urine due to the presence of structural or
functional changes in the urinary tract is known as Obstructive uropathy. It is
due to functional or anatomic lesions that can be located anywhere in the
urinary tract.

techniques had been described to demonstrate urinary tract. However, only CT
Urography and MR Urography has ability to describe entire urinary system along
with surrounding structures.1

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Hennig J
described Magnetic resonance urography (MRU) in 1987 at the University Hospital
of Freiburg Germany, as a complementary method to evaluate urinary tract
abnormalities.2 Technique
of MR urographic for demonstration of the urinary tract can be divided into two
categories: static-fluid MR urography and excretory MR urography. Due to the long T2
relaxation time of fluid in the collecting system, heavily T2-weighted
sequences have been used in
static-fluid MR urography to image the urinary tract as a static collection of
fluid. This can be repeated
with cine MR urography to confirm stenosis. Excretory MR urography is performed with the help of intravenous
administration of gadolinium contrast during excretory phase. Diuretic
administration can be useful in excretory MR urography in demonstration of
nondilated collecting systems.3,4

MRU provides a non-invasive visualization not
only of the collecting system but also of the renal parenchyma using fast spin-echo
pulse sequences as well.

The present study evaluates the cause and level of urinary
obstruction in patients with obstructive uropathy using MR Urography and
correlates it with the intra-operative findings and clinical follow-up. 


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