The Zenith Dissection Endovascular System consists of Zenith TX2 Dissection Endovascular Graft with Pro-Form and Zenith Dissection Endovascular Stent. Zenith TX2 Dissection Endovascular Graft with Pro-Form is designed to seal the entrance tear and excludes aneurysms related to chronic dissection. The Zenith Dissection Endovascular Stent is designed to be used as a distal component to support the stratified portion of the non-aneurysm aorta with dissection distal to a Zenith TX2 Dissection Endovascular Graft with Pro-Form.