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Schematic showing how an off-axis ACP/Amulet lobe results in contrast diffusing through the side edge of the lobe (not covered by polyester fabric, which is a thin layer sewn to the proximal part of the lobe). Proper alignment of the lobe entails perpendicular apposition of the lobe against the wall of the LAA at the neck (✓); poor alignment with the lobe is off-axis at the LAA neck (X).
