[A Huge Aortic Root Aneurysm Nineteen Years After Aortic Valve Replacement:Report of a Case].

We report a case of huge aortic root aneurysm 19 years after aortic valve replacement. A 58-year-old woman was referred to us for aortic root dilatation. She underwent aortic valve replacement with mechanical valve due to severe aortic regurgitation of tricuspid aortic valve 19 years ago. We performed graft replacement of aortic root preserving prior mechanical prosthetic valve. Histological examination of aneurysm showed myxomatous change in medial layer. Aortic root dilatation after aortic valve replacement is caused by bicuspid valve, aortic dissection, Marfan syndrome, tissue disorder disease, aortitis, and dilated Valsalva sinus at the time of prior operation. It is important to follow-up a patient for root dilatation after aortic valve replacement.