CARAT Case Studies: Coronary Artery Variants and Anomalies (CAVA)

Case Study A11-2: Anomalous origin of RCA from LC Sinus

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LCA – AP Cran
Common origin of RCA and LCA. Note course of large ramus branch extending to distal PDA territory.

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LCA – LAO Cran
Proximal anomalous RCA course between Ao and PA. Note small PL branches and dual small PDA.

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LCA – RAO Caud
No significant proximal branches from LCx.

Anatomy –Variants include: origin of anomalous RCA from LCA sinus, then following a course between the aorta and PA; a large ramus branch variant is also present extending the distal PDA territory.

Construction –  (Select Settings > Choose Button Q Nums.)  This RCA anomaly is selected by RCA Template button Q2.3.2. The ramus variant is drawn by selecting the Anomalous Marginals Tab Q6.4.1 and then using the “Move Branch” function to move the branch to a ramus position (it will be necessary to move the proximal and distal ends of the ‘lines’ of this branch to realign the artery with the heart border.

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