CTICasesAnomalous Left Main Coronary Artery
Imaging findings
CT coronary angiography shows an anomalous origin of the left main coronary artery from the right coronary cusp. The vessel takes a transseptal course through the interventricular septum, exhibiting a downward inflection (hammock sign) on sagittal reconstruction.
Key takeaways
An anomalous left main coronary artery taking a transseptal course is generally a benign vascular variant. It is characterized on imaging by the hammock sign, which represents the downward loop of the artery as it passes through the muscular interventricular septum before branching into the LAD and circumflex.
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