ACR Appropriateness Criteria® Thoracic Aortic Aneurysm or Dissection-Treatment Planning and Follow-Up: 2024 Update.

Diseases of the thoracic aorta include two broad categories: aneurysmal dilation involving all three layers of the intact aortic wall, and acute aortic syndromes, wherein at least one layer of the aortic wall is disrupted, such as in aortic dissection. These diseases carry a variable risk of subsequent aortic rupture, which is associated with high morbidity and mortality. Imaging is critical in the diagnosis, surveillance, and treatment of this constellation of diseases. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision process support the systematic analysis of the medical literature from peer reviewed journals. Established methodology principles such as Grading of Recommendations Assessment, Development, and Evaluation or GRADE are adapted to evaluate the evidence. The RAND/UCLA Appropriateness Method User Manual provides the methodology to determine the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where peer reviewed literature is lacking or equivocal, experts may be the primary evidentiary source available to formulate a recommendation.