What are the coronary computed tomography angiography (CCTA) anatomic findings of dominance?

Updated: Dec 21, 2017
  • Author: Eugene C Lin, MD; Chief Editor: Eugene C Lin, MD  more...
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Answer

Answer

Right dominant (80-85%): Both the PDA and the posterolateral (also called posterior ventricular) branches arise from the RCA.

Right coronary artery (RCA): Volume-rendered CT im Right coronary artery (RCA): Volume-rendered CT image of the RCA demonstrates a right-dominant RCA with acute marginal, posterior descending artery, and posterior ventricular branches.

Left dominant (15-20%): Both the PDA and the posterolateral branches arise from the circumflex.

Left-dominant system: Volume-rendered CT image dem Left-dominant system: Volume-rendered CT image demonstrates a left-dominant system with the posterior descending artery (PDA) (arrowhead) and a posterolateral branch (white arrow) arising from the circumflex artery (black arrow).

Codominant (5%): The PDA arises from the RCA. The posterolateral branches arise from the circumflex.

Codominant system: Volume-rendered CT image demons Codominant system: Volume-rendered CT image demonstrates a codominant system with the posterior descending artery (arrow) arising from the right coronary artery (RCA) and a posterior ventricular branch (arrowhead) arising from the circumflex.

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