Sonographic detection of renal and ureteral stones: value of the twinkling sign
Int. braz. j. urol
; 35(5): 532-541, Sept.-Oct. 2009. ilus, tab
Article
in English
| LILACS
| ID: lil-532766
Responsible library:
BR1.1
ABSTRACT
Purpose:
To compare the detection of urinary stones using standard gray scale ultrasound for diagnostic accuracy using the color Doppler "twinkling sign". Material andMethods:
Our study population consisted of forty-one patients who demonstrated at least one urinary stone on unenhanced CT evaluation of the kidneys or ureters. Each patient was evaluated using gray scale ultrasound and color Doppler imaging by an observer who was blinded to the CT results.Results:
Seventy-seven stones were present in 41 patients, including 47 intrarenal stones, 5 stones in the renal pelvis, 8 stones at the ureteropelvic junction, 5 ureteral stones and 12 stones at the ureterovesical junction. Based upon gray scale sonography the diagnosis of stone was made with confidence in 66 percent (51/77) of locations. Based upon Doppler sonography using the twinkling sign, the diagnosis of stone was made with confidence in 97 percent (75/77) of locations. Clustered ROC analysis demonstrated that the Doppler twinkling sign (Az = 0.99) was significantly better than conventional gray scale criteria (Az = 0.95) for the diagnosis of urinary stones (p = 0.005, two-sided test).Conclusions:
The color Doppler twinkling sign improves the detection, confidence and overall accuracy of diagnosis for renal and ureteral stones with minimal loss of specificity.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Kidney Calculi
/
Ureteral Calculi
/
Ultrasonography, Doppler, Color
Type of study:
Diagnostic study
/
Prognostic study
Limits:
Adult
/
Aged
/
Female
/
Humans
/
Male
Language:
English
Journal:
Int. braz. j. urol
Journal subject:
Urology
Year:
2009
Document type:
Article
Affiliation country:
Austria
Institution/Affiliation country:
Medical University Innsbruck/AT