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BACKGROUND Eccentricity of coronary ostial positions in relation to the aortic valve cusp may influence the target laceration location in BASILICA (Bioprosthetic or native Aortic Scallop Intentional Laceration to prevent Coronary Artery obstruction). Eccentricity of the coronary ostia in relation to coronary cusps of native and valve-in-valve transcatheter aortic valve replacement (TAVR) was not well described before. METHODS A total of 121 pre-TAVR patients' CT data (72 native valves TAVR and 49 bioprosthetic surgical valves TAVR) was