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Significant risk factors for expansion events were aortic dilation at the celiac level (hazard ratio [HR], 1.11; P= .015), saccular aneurysm formation of the false lumen (HR, 5.08; P= .049), and high number of residual large reentries (5 mm) (HR, 2.78; P= .027). In patients undergoing TEVAR for chronic DeBakey IIIb aortic dissection, late aortic expansion in both the thoracic and abdominal aorta remains an important issue. Aggressive additional intervention should be considered for high-risk patients with residual large reentries and aortic dilation at