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Patients with Marfan syndrome who present with a dual aortic aneurysm are not uncommon in clinical practice; however, the management of these patients is a significant challenge. We present a unique case of aortic root aneurysm and challenging infrarenal abdominal aortic aneurysm (AAA) with a short and angulated neck. We performed simultaneous repair using the Bentall procedure and ascending aortobiiliac bypass. Endovascular obliteration of the AAA neck and bilateral common iliac arteries was also performed. The perioperative process was uneventful. Normal functioning of the mechanical valve and complete thrombosis of the AAA sac were confirmed on follow-up computed tomography and echocardiography. This report suggests that combined ascending aortobiiliac bypass and endovascular obliteration with the Bentall procedure for dual aortic aneurysm is a useful surgical strategy for patients with Marfan syndrome. Life-long follow-up and medication ought to be mandatory to prevent incomplete exclusion and bypass occlusion., (© 2023 Wiley Periodicals LLC.)