Phase II Clinical Study of the Safety and Efficacy of the Relay Thoracic Stent-Graft

Inclusion Criteria: * Subjects with diagnosed descending thoracic aneurysm or penetrating ulcer * Subjects whose anatomy can accommodate the Relay device * Subjects who consent to participate * Subjects who agree to a follow-up schedule Exclusion Criteria: * Subjects with lesions other than thoracic aneurysm and penetrating ulcer * Subjects with less than 1 year life expectancy * Subjects who are pregnant * Subjects with medical conditions that wold complicate the endovascular procedure or confound results (e.g., Marfan's syndrome, morbid obesity, severe coronary artery disease) * Subjects participating in another investigational study