Abstract
A 74-year-old man underwent aortic valve replacement due to aortic regurgitation after two months of medication for congestive heart failure. At surgery, the cause of the aortic regurgitation appeared to be dehiscence of an aortic valve commissure. Dehiscence was closed with mattress sutures from outside of the sinus. Dehiscence of an aortic valve commissure is rare and difficult to be diagnosed preoperatively, and we carefully repaired it, and the patient had a good recovery.
