AI-CARE: Artificial Intelligence for Cardiovascular Analysis and Risk Evaluation

* Adults ≥22 years at time of imaging * Studies performed 1 Jan 2016 - 31 August 2025 * CT imaging of the whole, thoracic, or abdominal aorta, with or without contrast enhancement, acquired with any gating protocol (including non-gated) * Slice thickness ≤ 3mm * CT imaging in which truncation creates discontinuity within a targeted aortic region, preventing reliable diameter measurement (e.g., cardiac-focused CT acquisitions where an incomplete or absent aortic arch creates discontinuity between the aortic root and the descending thoracic aorta) o Partial aortic coverage is not grounds for exclusion. Where truncation affects individual regions, only those specific regions will be excluded from analysis; remaining fully captured regions will be retained for measurement. * Metal implants \<5cm from aorta (e.g. thoracic stent) * Prior aortic surgery * Severe motion artifacts (e.g. \>3mm vessel blurring) * Congenital aortic anomalies (e.g. coarctation, vascular rings) * Post-traumatic aortic repairs * The patient opted out of having their data used for medical research before the date of cross-referencing by the site team