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Obvious thrombus (yellow arrow) appeared in the oxygenator of the cardiopulmonary bypass circuit at the end of the procedure in Case 3. Association between severe bleeding and this thrombus formation remains unclear (A). Normal appearance of an oxygenator without thrombus (yellow arrow) at the same timing in another patient with type A aortic dissection repair for comparison (B). (Color version of figure is available online at http://www.semthorcardiovascsurg.com.)
