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Anteroposterior and lateral x rays of an Ionescu-Shiley pericardial bioprosthesis showing the valve ring in three parts. Two of the three cusps show radio opaque areas of calcification (arrows). (C) The flow surface and (D) the non-flow views of an Ionescu-Shiley bovine pericardial valve. Pannus (arrows) is seen on the flow surface.
