Role of Multidetector Non-Contrast CT Scan in Estimation of Attenuation Value of Urinary Calculi and Predicting the Outcome of ESWL
Introduction: Urolithiasis is a frequent condition that is becoming more common around the world. For patients with acute renal colic, non-contrast computed tomography (NCCT) is the gold standard imaging modality. For urolithiasis, extracorporeal shock wave lithotripsy (ESWL) has emerged as the therapy of choice. According to NCCT, the attenuation value in Hounsfield units is a major predictor of ESWL success. The goal of this study was to use NCCT to assess the attenuation value of urinary calculi and to compare it to the results of ESWL. Materials & Method: This study is a prospective analytical study of 75 patients with urolithiasis who have undergone NCCT and ESWL at Ramaiah Medical college and hospitals, Bengaluru, Karnataka. The study period was from November 2013 to June 2015. Results: The successful outcome post ESWL in different groups of attenuation value are 100% in group 1(<500HU), 92.6% in group 2(500-1000HU) and 33.3% in group 3(>1000HU). The failure rate was 7.3% in group 1 and 66.6% in group 3. The calculus density above 1000 HU decreases the rate of successful outcome post ESWL. Conclusion: The NCCT-estimated attenuation value (HU) of urinary calculi predicts ESWL outcome, allowing patients to be identified as candidates for ESWL.
Author (S) Details
Dr. Deepti Naik
Department of Radio-diagnosis, Sri Devaraj Urs Medical College, Tamaka, Kolar, Karnataka, India.
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