A Comparative Study of Assessment of Renal Stones Using USG and CT scan

Renal stones, USG & CT scan

Abstract

Background: Renal stones, or nephrolithiasis, are a common problem worldwide. The present study was conducted to compare USG and CT scan in diagnosis of renal stones. Subjects and Methods: The present study was conducted on 76 cases of renal stones of both genders. USG Scan with Aloka SSD-500 with frequency convex probe, and Honda SSD-500 with frequency (3.5 MHz) convex probe was taken. Non-enhanced helical CT examinations were performed with an Elscint Helicat II scanner. Results: Out of 76 patients, males were 44 and females were 32. Age group 11-20 years had 12 patients, 21-30 had 24, 31-40 years had 35, 41-50 had 3 and >50 years had 2 patients. Types of stones were calcium oxalate in 43, calcium phosphate in 8, cystine in 21 and uric acid in 4. The difference was significant (P< 0.05). Out of 76 renal stones, USG diagnosed 61 positive and 3 negative while, CT diagnosed 59 positive and 5 negative.  Sensitivity of CT scan found to be 95% and USG showed 92%. Specificity of USG was 91% and CT was 87%. Conclusion: Both imaging modalities found to be effective in diagnosing renal stones. However, USG resulted in better results and hence CT should be considered if USG is not present.