The study examined the clinical characteristics and conditions of care for patients with acute aortic syndrome (AAS) that will identify patients at risk for increased morbidity and mortality and provide a basis for the eventual achievement of specific studies on the optimal therapeutic management according to different risk profiles. The aim of the Observatory is to provide a photograph "size" of practices in France at present, both in the larger centers than in smaller and optimize diagnostic and therapeutic currently available by the activation pathways of rational management.

Inclusion Criteria:

• Male or female age (e) over 18 years old
• Patients with a AAS duly authenticated by further tests
• Patients who consented to participate in the study

Exclusion Criteria:

• Refusal of consent for study participation and ancillary studies
• AAS occurring in the aftermath of a traumatic thoracic
• Diagnosis AAS aside in favor of an alternative diagnosis

Patients admitted to cardiology, radiology or surgery for a clinical picture suggestive of acute aortic syndrome whose diagnosis was subsequently confirmed in due course of hospitalization by further investigations.