Multi-detector spiral CT features and relationship between renal and perirenal changes in acute unilateral upper urinary tract obstruction

Objective To analyze the features of multi-detector spiral CT (MDCT) in renal and perirenal changes on the affected side in patients diagnosed with acute unilateral upper urinary tract obstruction, and explore the internal relationship between them. Methods Clinical data of 376 cases of acute unilateral upper urinary tract obstruction induced by calculi admitted to Nanhai Hospital from 2015 to 2017 were collected. All patients underwent MDCT scan. MDCT manifestations of the affected renal and perirenal changes were retrospectively analyzed. The correlation between the renal and perirenal changes was assessed by Spearman's rank correlation coefficient. Results The grade of perirenal changes was lowly associated with the degree of hydronephrosis (rs=0.194, P<0.001), moderately correlated with decreased renal parenchymal density (rs=0.387, P<0.001) and moderately associated with increased renal volume (rs=0.545, P<0.001). Conclusion Analysis of MDCT features of renal and perirenal space during acute unilateral upper urinary tract obstruction can enable us to understand the internal relationship. The severity of perirenal changes is intimately correlated with the degree of hydronephrosis and renal swelling. Key words: Upper urinary tract obstruction; Stone; Multi-detector spiral CT; Correlation coefficient