LMCA
Also written as: LMCA — Left Main Coronary Artery
Left main coronary artery. Short but critical vessel that supplies blood to the LAD and circumflex arteries.
Full Definition
The left main coronary artery (LMCA) is a short vessel (typically 10-15mm in length) originating from the left coronary cusp of the aorta, bifurcating into the left anterior descending (LAD) and left circumflex (LCX) arteries. Significant LMCA stenosis (>50%) is considered highly dangerous due to the large territory of myocardium at risk, often requiring urgent revascularization. LMCA disease may present as unstable angina, myocardial infarction, or sudden cardiac death. Imaging assessment requires careful evaluation due to overlap with other structures and potential for ostial disease.
Usage
Usage note: May be abbreviated as LM or LMCA; ensure context is clear when using shortened forms.
In Context
- "The LMCA showed 80% ostial stenosis requiring emergent revascularization." — Cardiac catheterization report
- "CCTA revealed calcified plaque in the distal LMCA extending into the bifurcation." — CT angiography report