Single raphe bicuspid aortic valve Bicuspid aortic valve with right-noncoronary cusp fusion 2017-06-10T12:00:04Z A type of bicuspid aortic valve (BAV) characterized by a single raphe between the right and noncoronary cusps (RN fusion pattern). This results in two leaflets with right-left leaflet orientation (also called the atypical pattern). There is thus one completely developed left cusp, two completely developed commissures, and one raphe between the underdeveloped right and noncoronary coronary cusps extending to the corresponding malformed commissure.