Marfan syndrome is an uncommon condition in pregnancy. We present the case of 37 years old gravida 1, para 1 with Marfan syndrome. She delivered at term by cesarean section, a healthy male infant weighing 3500 grams with Apgar's of 9. During the postoperative period she developed aortic dissection and was referred to the Cardiovascular Surgery Department. We described such a case and the difficult decisions that we faced.