@crossborderrn.tt: 🪾if there are TWO trunks coming off the left main artery (a bifurcation), it’s a very proximal OM branch, or “high OM”. If there are THREE trunks, you have a Ramus Intermedius. The three way split is called a trifurcation. My personal answer to the last image would be a high OM. My thinking is: i can see a clear bifurcation and the size of the vessel (small, it’s not a definitive but ramus usually is a decent sized artery). When in doubt, always check with the physician of how they would categorize it. And ask why!

CrossborderRN

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Monday 09 November 2026 14:40:50 GMT