Left circumflex arising from right coronary sinus

Left circumflex (LCx) arising from right coronary sinus (RCA) is a coronary arterial variant.

It is considered the most common coronary anomaly with prevalence range of around 0.37-1.3 % of all patients.

According to some publications, anomalous LCx is divided into 3 types 9

  • type I: separate ostia for right coronary artery (RCA) and LCx
  • type II: common ostia in the right sinus.
  • type III: LCX arising as a branch of the proximal RCA.

It commonly arises from a separate ostium within the right sinus, or as a proximal branch of the RCA. - i.e. left circumflex arising from right coronary artery

Although this anomaly is usually classified as benign and asymptomatic. There are occasional reports of sudden death, myocardial infarction, and angina pectoris in the absence of atherosclerotic lesions 1

Congenital coronary artery anomalies
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Article information

rID: 60945
System: Cardiac
Synonyms or Alternate Spellings:
  • LCx arising from right coronary sinus
  • Left circumflex arising from the right coronary sinus

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Cases and figures

  • Case 1: with retroaortic course
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