target vessel endoleaks was similar for fenestrations compared with directional branches (4% vs 6%; P ¼ .09). One of 36 patients died of unrelated causes, three had limited follow-up, and four underwent successful intervention before hospital dismissal because of concomitant target vessel stent compression. Of the 28 patients observed for a mean of 19 6 12 months, 20 patients (79%) had complete resolution in 6 to 8 weeks in 18 patients or within 6 months in two patients. Seven patients (25%) required redo stent placement, which resolved the endoleak in six with no complications. One patient with stable aneurysm sac was observed. Factors independently associated with target vessel endoleaks included inner aortic diameter 30 mm, higher number of targeted vessels, TAAAs, and physician-modified endografts. There was no aneurysm rupture, device migration, or conversion to open repair.Conclusions: Target vessel endoleaks were detected in 1 of 10 patients treated by F-BEVAR, with similar incidence for fenestrations and branches. Spontaneous resolution occurred in three of four patients after a short period. Among patients with persistent endoleaks, redo stenting was usually successful and uncomplicated, and there was no aneurysm rupture, device migration, or conversion to open repair.
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