马凡综合征患者二尖瓣可见左下方的小叶向上隆起，二尖瓣脱垂导致顶端的瓣叶(此区已变为红黑色)挫伤。
This view of the mitral valve in a patient with Marfan's syndrome depicts a floppy mitral valve. The leaflet on the lower left has ballooned upward and the prolapse has resulted in contusion of the top of the leaflet, with a red black area of discoloration.