Ramus intermedius

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Median ramus; ramus; MR

Overview

If an artery arises from the left main coronary artery between the left anterior descending artery (LAD) and the left circumflex artery (LCX), it is known as the ramus intermedius.

Epidemiology and Demographics

The ramus intermedius occurs in 37% of the general population, and is considered a normal variant.

Additional Images

Shown below are an animated image and a static image depicting the median ramus (MR).

LAD = Left anterior descending artery; LCx = Left circumflex artery; LM = Left main artery; MR = Median ramus.

References

Overview