Preprocedural imaging modalities in patients undergoing iliocaval venous recanalization and stent placement

Purpose: To determine the diagnostic accuracy of preinterventional imaging modalities in patients being evaluated for iliocaval venous recanalization and stent placement. Methods: Consecutive patients with iliocaval postthrombotic obstructions or nonthrombotic iliac vein lesions (NIVL), who were scheduled for recanalization, underwent duplex ultrasound (DUS), magnetic resonance venography (MRV), multiplanar venography (MPV), and intravascular ultrasound (IVUS). The diagnostic accuracies of DUS, MRV, and MPV were analyzed using IVUS as reference. Results: A total of 216 limbs in 108 patients (80 patients with postthrombotic obstructions, 28 patients with NIVL) were examined. In patients with postthrombotic obstructions, the diagnostic sensitivities for the detection of lesions of the common femoral vein were 81% (95% CI 71–89%) for DUS, 76% (95% CI 65–85%) for MRV, and 86% (95% CI 76–93%) for MPV. The sensitivities for detecting lesions of the iliac veins were 96% (95% CI 89–99%) for DUS, 99% (95% CI 92–100%) for MRV, and 100% (95% CI 94–100%) for MPV. Regarding the inferior vena cava, the sensitivities were 44% (95% CI 24–65%) for DUS, 52% (95% CI 31–73%) for MRV, and 70% (95% CI 47–86%) for MPV. The sensitivities for detecting NIVL were 58% (95% CI 34–79%) for DUS, 90% (95% CI 68–97%) for MRV, and 95% (95% CI 73–99%) for MPV. Conclusion: In patients scheduled for recanalization of iliocaval postthrombotic obstructions, the sensitivities of DUS, MRV, and MPV were similar. In patients with suspected inferior vena cava involvement and in patients with NIVL, additional imaging with MR or conventional venography is required.