CTICasesFibrous Cord of the Aorta (Primitive Arch Remnant)
Imaging findings
CT angiogram reveals a thin, linear, non-obstructive band or cord-like structure traversing the lumen of the aortic arch. It mimics a dissection flap but lacks the typical longitudinal extension, thickening, or false lumen seen in acute aortic dissection.
Key takeaways
A fibrous cord of the aorta is a rare, benign, asymptomatic congenital remnant hypothesized to arise from a persistent fifth primitive aortic arch. Radiologists should recognize this entity as a benign anatomical variant to prevent misdiagnosing it as an acute aortic dissection or intraluminal thrombus, thereby avoiding unnecessary interventions.
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