Figure 1: Comparison of histological scores. In terms of fibrosis, atherosclerosis, medionecrosis, cystic medial necrosis, smooth muscle cell orientation, elastic fiber fragmentation, and inflammation in intra-operative obtained biopsies of the sinus section of ascending aorta aneurysms: Aneurysms in the BAV-group demonstrate mild changes in the media with up to incipient moderate ones. There was a significant difference in the histological scores in terms of elastic fragmentation between the groups of TAV and MFS by p=0.031, but a highly significant difference was between the groups of BAV and MFS by p<0.001.