Multidetector computerized tomography angiography to predict lumbar venous anatomy before donor nephrectomy

Area of Science:

• Radiology
• Surgical Anatomy
• Nephrology

Background:

• Unrecognized lumbar veins pose a significant risk during laparoscopic donor nephrectomy.
• Multidetector computerized tomography angiography (MDCTA) is increasingly used to assess renal anatomy preoperatively.
• Predicting lumbar vein anatomy with MDCTA before laparoscopic donor nephrectomy has not been previously established.

Purpose of the Study:

• To evaluate the efficacy of MDCTA in preoperatively predicting the size and location of anomalous left lumbar veins.
• To assess the accuracy of MDCTA in identifying lumbar venous anatomy relevant to laparoscopic donor nephrectomy.

Main Methods:

• Prospective study of patients undergoing left hand assisted laparoscopic donor nephrectomy (January 2003 - September 2004).
• All patients underwent 4-phase computerized tomography, including arterial and venous phases with 1.25 mm collimation.
• MDCT angiograms were reviewed prospectively by a radiologist and surgeon, and retrospectively by a blinded radiologist.

Main Results:

• Of 65 patients, 54 (83%) had at least one anomalous lumbar vein; 33 (51%) had veins 3 mm or larger.
• MDCTA demonstrated high performance: sensitivity 97%, specificity 91%, positive predictive value 91.4%, negative predictive value 97%, and accuracy 94% compared to surgical findings.
• The study identified a significant prevalence of anomalous lumbar veins requiring careful surgical consideration.

Conclusions:

• MDCTA is a highly accurate imaging modality for predicting lumbar venous anatomy prior to donor nephrectomy.
• The high sensitivity, specificity, and accuracy of MDCTA support its routine use to enhance surgical planning and patient safety.
• Preoperative identification of lumbar veins via MDCTA can mitigate intraoperative risks associated with laparoscopic donor nephrectomy.