Computed tomography angiogram: accuracy in renal surgery

Area of Science:

• Urology
• Radiology
• Medical Imaging

Background:

• Uretero-pelvic junction obstruction (UPJO) can be caused by aberrant renal vasculature.
• Accurate pre-operative assessment of renal vascular anatomy is crucial for surgical planning and treatment of UPJO.

Purpose of the Study:

• To evaluate the sensitivity and specificity of computed tomography angiogram (CTA) in identifying renal arteries and veins.
• To assess CTA's ability to detect crossing vessels contributing to UPJO.
• To determine if CTA findings can inform UPJO treatment algorithms.

Main Methods:

• Prospective study of 118 patients undergoing renal surgery (April 2005-October 2006).
• All patients underwent multi-detector CTA with arterial and venous phases.
• CTA results were compared with intra-operative findings.

Main Results:

• CTA demonstrated high accuracy in detecting the number and location of renal arteries and veins.
• Specific accuracies included 93% sensitivity for single renal arteries and 92% specificity for multiple renal arteries.
• CTA achieved 100% accuracy for early-dividing renal arteries and 83.3% for crossing vessels at the UPJ, with 85% of surgeons finding it helpful pre-operatively.

Conclusions:

• Computed tomography angiogram is a simple and rapid imaging modality.
• CTA provides accurate pre-operative information on renal vascular anatomy.
• This information is valuable for surgical decision-making in UPJO management.