Aortic valve endocarditis. This image is from an elderly patient with calcific aortic stenosis developed endocarditis. Vegetation with ulceration arising from the noncoronary cusp has extended through the interventricular septum and into the right atrial cavity just above the tricuspid valve annulus.

Perivalvular abscess. Dorsal view of the aortic root and valve. Streptococcal endocarditis in a A severely calcified bicuspid aortic valve was complicated by a large abscess beneath and around the right coronary sinus, burrowing into the interventricular septum and crista supraventricularis.

Histologically acute endocarditis shows fibrinous vegetations