Figure 7From: Papillary fibroelastoma of the aortic valve - a case report and literature review Histological section of the excised mass showing benign papillary lesion comprised of a single layer of endocardial cells overlies a thin layer of mucopolysaccharide matrix and underlying, almost acellular, avascular stroma composed predominantly of elastic fibers and a small amount of collagen. (Hematoxylin and Eosin stain, magnification × 40)Back to article page