Concordancia entre ultrasonografía y urotomografía en el tamizaje y diagnóstico de urolitiasis en una población endémica.

Aim. To determine the concordance between ultrasonography and urotomography for screening and early diagnosis in patients with suspected urolithiasis. Material and methods. 140 patients older than 18 years old with suspected urolithiasis were studied. An ultrasonography scan was performed to determine the stone presence and their size. Subsequently, patients were examined using a simple phase urotomograph and stones were classified by their location, size and density. The stones sizes were also determined (screening). Moreover, concordances, sensitivity and specificity for both imaging methods were estimated. Results. When using urotomography, kidney stones were observed in 94 patients, ureter stones in 26 patients and bladder stones in 20 patients. In comparison, ultrasonography identified kidney, ureter and bladder stones in 84% (79 vs 94 patients), 84.6% (22 vs 26 patients) and 100% (20 vs 20 patients) of the analyzed population, respectively. Estimated concordances in kidney, ureters and bladder were 61% (88% sensitivity, 90% specificity), 75% (95% sensitivity, 90% specificity) and 98% (99% sensitivity and specificity) respectively. Conclusions. Ultrasonography is a reliable method for the early diagnosis of patients with clinical suspicion of urolithiasis. The method has high sensitivity when it is operated by specialized professionals.