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bjective: The current gold standard for the diagnosis ofureteric stones in patients with a stent in situ is ureteroscopy but this study is planned to determine the positive predictive value ofcomputerized tomography (CT) scan among such patients. Methods: This study involved patients who had ureteral stent in situ and were referred for re-evaluation ofresidual stones after extracorporeal shock wave lithotripsy. These patients underwent CT-scan for detection ofureteric stone. Later on, ureteroscopy was performed and ureteric stone was confirmed on direct visualization. Results: The mean age ofthe patients was 32.2±8.9 years. Male to female ratio of1.7:1. CT scan shows a stone in 252 patients (70.2%) out ofwhich 165 (46.0%) were confirmed on ureteroscopy. This yielded a sensitivity of88.7 %, specificity of49.7 %, positive predictive value of65.5%, negative predictive value of80.4% and diagnostic accuracy of69.9% ofCT for detecting ureteric calculi in patients with ureteric stents (p value < 0.0001).Conclusion: CT scan owing to its limited diagnostic accuracy cannot replace ureteroscopy for detection ofureteric stones in patients with ureteric stents.
Nawaz Rashid, Zia-ur -Rehman, Iqbal Hussain Dogar, Kamran Sajjad Hashmi, Fareeha Nawaz. (2022) Predictability of Computerized Tomography as Compared to Ureteroscopy in Detection of Ureteric Stone in Patients with Indwelling Stents, , volume 28, issue 2.
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