A prominent brachiocephalic vein masquerading as an aortic dissection flap on transthoracic echocardiogram: A case for multimodality imaging

A 30‐year‐old female patient with past medical history of supraventricular tachycardia presented with shortness of breath and underwent a transthoracic echocardiogram (TTE). The TTE noted a concerning partially mobile linear echo density, with positive Doppler color flow across it along the aortic arch, which was concerning for a dissection flap. The patient accordingly underwent a cardiac MRI which revealed that the anomaly seen on echocardiogram was in the setting of a prominent left brachiocephalic (innominate) vein and without evidence of aortic dissection. While this is a relatively common phenomenon, there is no literature on prominent brachiocephalic vein masquerading as an aortic dissection flap on TTE.