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24 April 2013 : Original article  

Correlation of volume, position of stone, and hydronephrosis with microhematuria in patients with solitary urolithiasis

Mehmet Fatih InciABCDEF, Fuat OzkanABCE, Selim BozkurtBDE, Mustafa Haki SucakliBCD, Bulent AltunolukABD, Mehmet OkumusBDF

DOI: 10.12659/MSM.889077

Med Sci Monit 2013; 19:295-299

Abstract

BACKGROUND: The aim of this study was to determine the relationship between hematuria and volume, position of stone, and hydronephrosis in patients with a solitary stone, using unenhanced multidetector computed tomography (MDCT).

MATERIAL AND METHODS: This retrospective study evaluated the clinical and radiological records of 83 patients undergoing MDCT for the evaluation of acute flank pain and suspected renal colic, who also underwent a microscopic urinalysis at the emergency department of our hospital during a 1-year period. Inclusion criteria of the MDCT study were solitary urolithiasis and cumulative stone diameter under 1 cm.

RESULTS: A total of 83 patients were included in the study, with a mean age of 42.1±14.4 years; 48 (57.8%) were females and 35 (42.2%) were males. Detection of 5 or more red cells on urinalysis was regarded as microscopic hematuria, and was positive in 46 patients (55.4%). There was a positive correlation between the position of the stone (especially upper two-thirds ureteral stones) and microhematuria rate (r: 0.28, p=0.009). There was a statistically significant difference in presence of hydronephrosis between the microhematuria (36 patients, 78%) and non-microhematuria (12 patients, 32%) groups (p<0.001). The median stone volume between the microhematuria and non-microhematuria groups were not statistically different, 37.5 mm3 (range 5–425) and 28 mm3 (range 4–412), respectively (p=0.39).

CONCLUSIONS: Although stone volume is one of the best indicators of stone burden, it was not correlated with microhematuria. However, in patients with renal colic, microhematuria requires ultrasound examination whether hydronephrosis and ureteral stones are present or not. Further studies with larger sample sizes are warranted.

Keywords: multidetector computed tomography, Hydronephrosis - radiography, Hematuria - radiography, Urolithiasis - radiography

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750