Retrospective Real-World Data Collection of the Conformable GORE® TAG® Thoracic Endoprosthesis When Used in Frozen Elephant Trunk Procedures for Treatment of Aortic Aneurysms and Dissections

Retrospective, multicenter, single-arm registry data collection designed to characterize outcomes in patients treated with the Conformable GORE® TAG® Thoracic Endoprosthesis deployed in an antegrade fashion as part of a frozen elephant trunk (FET) procedure and to assess the safety and performance of the Conformable GORE® TAG® Thoracic Endoprosthesis deployed antegrade as part of a FET procedure. This will be evaluated using real-world data and Computed Tomography (CT) imaging abstracted through retrospective chart review.

• Antegrade deployment of covered thoracic aortic stent graft as completion in frozen elephant trunk procedure (Device): Antegrade deployment of covered thoracic aortic stent graft as completion in frozen elephant trunk procedure

Primary outcomes

• MAE freedom within one year (365 days) post-implant [From date of index procedure through 365 days post implant]: The primary endpoint will be measured as freedom from the composite of the following major adverse events (MAE) occurring within one year (365 days) post-implant: * Permanent Stroke * Permanent Paraplegia/ Paraparesis * Mortality * Reoperation

Secondary outcomes

• Freedom from imaging outcomes within the 12-Month analysis window [From the date of the index procedure through end of 12 months analysis window unless otherwise specified]: The secondary endpoints will be measured as freedom from each of the following imaging outcomes within the 12-Month analysis window unless specified: * Failed Patency (within one year (365 days) post-implant) * Pseudoaneurysm (within one year (365 days) post-implant) * Increase in Aortic Diameter * Device Integrity * Device Migration * Type IA Endoleak * Type IB Endoleak * Type III Endoleak * Thrombosis of Index Pathology

Sex: All, ages: 18 Years to any

Inclusion Criteria:

1. Treated for aneurysm or dissection using antegrade deployed Conformable GORE® TAG® Thoracic Endoprosthesis (CTAG) device at least 12 months prior to date of enrollment.
2. Age ≥ 18 years at the time of the index procedure.
3. Proximal extent of the Conformable GORE® TAG® Thoracic Endoprosthesis (CTAG) device is sutured to the aorta and/or distal aspect of the surgical graft.
4. Informed Consent Form (ICF) is signed by the subject or a legally authorized representative, or a waiver of consent is granted by the IRB of record and appropriately documented by the enrolling site.

Exclusion Criteria:

1. Any modification performed on the CTAG Device, excluding suturing.
2. Procedure performed in the setting of infection requiring treatment with parenteral anti-infective medication.
3. Pregnant at the time of the index procedure.
4. Aneurysm or Subacute / Chronic Dissection cases (onset of symptoms ≥15 days prior to the date of the procedure) with documented aortic rupture at the time of the index procedure.