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Limited data is available on the use of a polyester graft limb with a helical stent configuration deployed in the external iliac artery (EIA) during endovascular aneurysm repair (EVAR), so we prospectively analyzed the efficacy of the Zenith Spiral-Z limb deployed in the EIA.Methods and ResultsPatients undergoing EVAR using a Zenith stent-graft and Spiral-Z limb deployed in the EIA were prospectively registered in 24 Japanese institutions from June 2017 to November 2017. In total, 65 patients (74 limbs) (mean age 77.1±8.0 years, 87.7% men, mean abdominal ao