Introduction: Intraoperative rupture of an aortic root and ascending aortic aneurysm is rare. However rupture of the aneurysm in this group of patients is challenging and associated with fatal outcomes. Case Report: we report the case of a 31-year-old Marfan syndrome patient with a huge aortic root and ascending aortic aneurysm. Median sternotomy and vertical opening of the pericardium were performed. Aneurysm rupture occurred before cannulation on its anterior surface. Intra-operative and postoperative management were successful. There were no neurological, hemodynamic or hemorrhagic complications. Conclusion: Intra-operative aneurysm rupture is rare and challenging. However, fast bleeding control and cannulation is compulsory in the management in this situation.

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