A 52-year-old man had a history that included aortic valve replacement due to infectious endocarditis in 1987. Chest X-ray showed slight enlargement of the superior mediastinum in 1998, but the enlargement was very mild and there had not been any significant change since 1998. However, chest X-ray demonstrated an extremely protruding mass on the right side of the superior mediastinum in May 2004 and a pseudoaneurysm located in the ascending aorta was demonstrated by computed tomography. We considered this aneurysm had been caused by ascending aortic cannulation for blood return from cardiopulmonary bypass (CPB) during the previous surgery. On re-operation, CPB was established by femoro-femoral bypass and median sternotomy was performed. The pseudoaneurysm measured 60mm in diameter and there was a felt-pledget on top of the aneurysm. Under deep hypothermic cardiac arrest, we incised the aneurysm and closed the orifice of the pseudoaneurysm using a patch (Hemashield Woven Fabrics). On pathological examination, the wall of the pseudoaneurysm showed a structural loss of the blood vessel and the felt-pledget had been exposed to the inferior of the aneurysm breaking through the wall. We considered this a non-mycotic pseudoaneurysm because of this patient's clinical course, surgical and pathological findings. We encountered a pseudoaneurysm in the ascending aorta that was detected and treated surgically about 20 years after aortic valve replacement.

Background: With improvements in the safety and stability of surgeries, the number of orthognathic surgeries is increasing. Most patients who undergo orthognathic surgeries are younger, and the number of orthognathic surgeries for patients with comorbidities is also increasing. We report a survey and clinical investigation of patients with comorbidities who underwent orthognathic surgeries at our department to improve the safety of orthognathic surgery. Results: The participants included 296 men and 712 women, with a mean age of 28 years (13–19 years, n=144; 20–29 years, n=483; 30–39 years, n=236; 40–49 years, n=102; 50–59 years, n=39; ≥60 years, n=4). In total, 347 patients underwent one-stage Le Fort type I osteotomy and sagittal split ramus osteotomy (SSRO), 243 underwent SSRO, 287 underwent plate removal, 126 underwent genioplasty and plate removal, and five underwent other surgeries. In total, 529 patients had comorbidities (52%), including allergic diseases (n=220, 33%), respiratory diseases (n=107, 16%), neurologic and psychiatric diseases (n=69, 10%), gynecologic diseases (n=28, 4%), hematologic diseases (n=27, 4%), cardiovascular diseases (n=24, 4%), digestive diseases (n=22, 3%), metabolic and endocrine diseases (n=18, 3%), spinal diseases (n=11, 2%), ophthalmologic diseases (n=11, 2%), renal and urological diseases (n=9, 1%), and other diseases (n=117, 18%). Among the patients with comorbidities, 11 with hemorrhagic diatheses (hemophilia and von Willebrand disease), arrhythmia (atrioventricular block), psychiatric disease (adjustment disorder), and metabolic disease (diabetes) required cautious perioperative management. The patient with hemophilia was managed with regular low-dose recombinant factor VIII replacement therapy, and the patient with type I diabetes mellitus was administered continuous insulin infusion and sliding-scale insulin therapy; both patients had an uneventful course. Conclusions The study findings suggest that with the increase in orthognathic surgeries, oral and maxillofacial surgeons should adequately manage cases requiring cautious perioperative control and highlight the importance of preoperative screening. Despite the well-established safety and postoperative stability of orthognathic surgeries, oral surgeons should adopt appropriate additional preventive measures for patients with comorbidities.