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Acute Ureteric Calculus Obstruction: Unenhanced Spiral CT Versus MR Urography and Abdominal Radiograph

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Date
2012
Author
M. Saaid, Emhmed
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Abstract
The main aim of this study was to compare the performance of unenhanced spiral CT to the combination of MR urography (MRU) and plain abdominal radiography (KUB) in patients suspected of having acute calculus ureteric obstruction. 64 patients with suspected acute calculus ureteric obstruction were evaluated. The presence of perirenal fluid, presence and level of ureteric obstruction and calculi were assessed on both techniques. 44 out of 64 (69%) patients had acute calculus ureteric obstruction based on clinical, radiographic or surgical findings. MRU showed perirenal fluid in acute ureteric obstruction (77%) with a greater sensitivity than CT showed stranding (45%). The combination of fluid and ureteric dilation on MRU showed a sensitivity of 93% (CT 80%), specificity of 95% (CT 85%), and accuracy of 94% (CT 81%). KUB showed ureteric calculi in 21/29 (72%) of patients with calculi seen by CT. Overall, MRU/KUB revealed 2.4 abnormalities per acutely obstructed ureter compared with 1.8 abnormalities detected by CT. MRU/KUB using HASTE sequences can diagnose the presence of acute calculus ureteric obstruction with similar accuracy to spiral CT. This technique has less observer variability and is more accurate than CT in detecting evidence of obstruction such as perirenal fluid.
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http://dspace.idpsebhau.edu.ly//handle/1/216
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