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Distal ureteral calculi: US follow-up.
Moesbergen, Todd C; de Ryke, Rex J; Dunbar, Sally; Wells, J Elisabeth; Anderson, Nigel G.
  • Moesbergen TC; Department of Radiology, Christchurch Hospital, 2 Riccarton Ave, Christchurch, Canterbury 8011, New Zealand. tmoesbergen@hotmail.com
Radiology ; 260(2): 575-80, 2011 Aug.
Article en En | MEDLINE | ID: mdl-21555351
ABSTRACT

PURPOSE:

To assess accuracy of ultrasonographic (US) follow-up of distal ureteral calculi by using computed tomography (CT) and conventional radiography (kidneys, ureters, and bladder) as reference standards. MATERIALS AND

METHODS:

The study was approved by the Regional Ethics Committee, and written informed consent was obtained. One hundred fifty-eight patients with CT-diagnosed symptomatic ureteral calculi, for whom follow-up imaging was ordered, were enrolled from February 2006 to December 2008. Six were excluded, having not met study entry criteria, with 121 men (mean age, 49 years; range, 20-91 years) and 31 women (mean age, 44 years; range, 34-77 years) completing the protocol with adequate reference standard imaging. Targeted transabdominal US occurred coincidently with follow-up CT (n = 92) or radiography (n = 60), with US evaluation prospectively compared considering sensitivity and specificity. Statistical analysis was performed with a χ(2) test, t test, or paired t test, as appropriate.

RESULTS:

Results of nine US examinations were nondiagnostic because of inadequate ureteral visualization, and among these, two cases showed residual distal calculi. Of the remaining 143 patients, 33 had residual distal calculi, all visualized with US. There was a single false-positive study, giving sensitivity, including nondiagnostic US examinations, of 94.3% (95% confidence interval [CI] 80.8%, 99.3%) and specificity of 99.1% (95% CI 95.3%, 100%). All calculi appeared hyperechoic with posterior acoustic shadowing. Additional diagnostic features included presence of a hypoechoic rim and Doppler twinkle artifact. Mean stone length was 7.2 mm ± 2.6 (standard deviation) (range, 4-18 mm). Mean ureteral length visualized was 36.4 mm (range, 12-77 mm), with calculi positioned at a mean of 13.1 mm ± 11.2 (range, 0-40 mm) from the ureterovesical junction (UVJ). Nondiagnostic results were more likely with bladder volume of 110 mL or less (eight [16%] of 50 vs one [1%] of 102, P = .0009).

CONCLUSION:

Ureteral calculi within 35 mm of the UVJ can be accurately followed-up by using transabdominal US, which substantially reduces patient radiation burden.
Asunto(s)

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Cálculos Ureterales Tipo de estudio: Diagnostic_studies / Guideline / Observational_studies / Prognostic_studies Límite: Adult / Aged / Aged80 / Female / Humans / Male / Middle aged Idioma: En Año: 2011 Tipo del documento: Article

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Cálculos Ureterales Tipo de estudio: Diagnostic_studies / Guideline / Observational_studies / Prognostic_studies Límite: Adult / Aged / Aged80 / Female / Humans / Male / Middle aged Idioma: En Año: 2011 Tipo del documento: Article