[Thoracic Aortic Aneurysm due to Giant Cell Arteritis;Report of a Case].

A 70-year-old man with an ascending aortic aneurysm was referred to our hospital. He had not shown any head symptoms and blood tests did not indicate any inflammation. Ascending aortic replacement was performed under cardiopulmonary bypass. Pathologic examination of the aneurysm wall was diagnosed for giant cell arteritis( GCA). Aortic aneurysm due to GCA without no symptom was extremely rare.