Comparative Study of Ultrasound and Computerized Tomography for Nephrolithiasis Detection
Introduction: Imaging is a vital cog in the wheel of diagnosis and management of patients suspected with renal and ureteric calculi, and it is imperative to choose the appropriate investigation that is accurate and safe for the patient. The choice of appropriate investigation depends on various factors such as the nature of presentation, body habitus of the patient, cost of the investigation, and the effect of the investigation on the patient. Many modalities are available for investigating stone in patients such as ultrasonography (US), X-ray, computed tomography (CT) scan, and magnetic resonance imaging (MRI). CT, US, and X-ray are used widely. Materials and methods: This Study Intended to classification of renal stone using U/S scan from different soft images of U/S machine during abdomen U/S. The data of this Study was collected from different clinical centres. Results: From the 150 sets of data collected, 45 calculi were identified on both USG and CTU. The sensitivity and specificity of renal calculi finding on USG were 53% and 85% respectively. The mean size of the renal calculus revealed on USG was 6.8 mm ± 3.8 mm and the mean size of the renal calculus not imagined on USG but identified on CTU was 3.5 mm ± 2.7 mm. The sensitivity and specificity of ureteric calculi finding on USG were 12% and 97% respectively. The sensitivity and specificity of urinary bladder calculi detection on USG were 20% and 100% respectively. Discussion: This study showed that USG had limited value for the detection of renal calculi. The sensitivity and specificity of 53% and 85% respectively were lesser contrast to two earlier studies that had stated 81% and 100%, and 76% and 100% for sensitivity and specificity respectively. However, our sensitivity exceeded that of another study, which reported a sensitivity of 24%, but a slightly higher specificity of 90%. The lengthier time interval between ultrasound and CTU (45% within 1 month, the rest 1 month or more) in this study could have donated to this difference, in compare to 1 month or less in earlier studies. Conclusion: The presence study revealed that accuracy of US in finding renal, ureteric and urinary bladder calculi were 68%, 80% and 99% Respectively