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Computed Tomography Imaging in Aortic Dissection.

Amanda H Westfall1, John S Garrett1

  • 1Baylor University Medical Center, Department of Emergency Medicine, Dallas, Texas.

Clinical Practice and Cases in Emergency Medicine
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Summary
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Triple-rule-out CT scans may miss aortic disease. A dedicated thoracic aorta CT angiography is crucial for diagnosing aortic conditions when suspicion is high, even if a CT pulmonary angiogram is initially negative.

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Area of Science:

  • Radiology and Imaging
  • Cardiovascular Imaging
  • Thoracic Imaging

Background:

  • Triple-rule-out (TRO) computed tomography (CT) is utilized by emergency physicians for simultaneous evaluation of coronary, pulmonary, and aortic arteries.
  • TRO CT aims for image quality comparable to dedicated CT angiography protocols for each vascular bed.

Purpose of the Study:

  • To emphasize the critical role of dedicated thoracic aorta CT angiography in diagnosing aortic disease.
  • To highlight potential limitations of TRO CT in detecting specific aortic pathologies.

Main Methods:

  • Case report detailing a clinical scenario involving suspected aortic disease.
  • Review of imaging findings from an initial CT pulmonary angiogram and subsequent dedicated thoracic aorta CT angiography.

Main Results:

  • The initial CT pulmonary angiogram was negative for aortic disease.
  • A subsequent dedicated thoracic aorta CT angiography revealed significant aortic pathology.

Conclusions:

  • A high clinical suspicion for aortic disease warrants a dedicated thoracic aorta CT angiography, irrespective of initial negative findings on TRO CT or CT pulmonary angiography.
  • Dedicated imaging protocols ensure optimal diagnostic accuracy for specific vascular structures like the aorta.