Such information may be particularly helpful when the flap spirals around the long axis of the aorta. Moreover, 3D TEE demonstrates the dissection flap not as a linear structure but as a sheet of tissue of variable thickness in the long, short, or oblique axis. This may make it possible to distinguish a true dissection flap from an artifact when it is relatively immobile. In addition, multiplane 3D TEE provides a more rapid and accurate evaluation of the aortic arch than 2D TEE.