Can we interpret the orientation of major or minor orifice in implanted tilting disc mechanical mitral valve on X-ray chest P-A view ? “The Sion Sign”

Abstract

Introduction Chest X-ray is an important investigation in a patient Following Mitral valve replacement. After Mitral valve replacement in Chest X-Ray Postero-Anterior (P-A) view the Prosthesis in the mitral Position is seen in sagital open position as opposed to a prosthesis in Aortic Position which is seen as coronal slit.